Di artikel Fisika kelas 12 kali ini, kita akan mempelajari tentang Hukum Coulomb secara lengkap, disertai dengan rumus dan pembahasan soalnya.
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Guys, kamu sudah tahu kan bahwa muatan listrik terdiri dari muatan positif dan negatif? Ternyata, muatan-muatan tersebut bisa menghasilkan gaya, lho! Yup, Hukum Coulomb-lah yang menjelaskan gaya yang terjadi antara muatan-muatan tersebut.
Nah, materi mengenai Hukum Coulomb sebenarnya sudah pernah kita pelajar di kelas 9, lho! Biar nggak lupa, kamu bisa cek materinya di sini yah guys. Di kelas 12 sekarang ini, saatnya kita belajar Hukum Coulomb lebih dalam lagi. Simak pembahasan berikut, kuy!
Mengenal Hukum Coulomb
Hukum Coulomb ditemukan oleh ahli fisika asal Prancis yang bernama Charles Augustin de Coulomb. Coulomb melakukan penelitan mengenai gaya yang ditimbulkan oleh dua benda yang diberi muatan listrik dan dipisahkan oleh jarak tertentu.
Hukum Coulomb pada dasarnya menyatakan bahwa interaksi muatan listrik yang sejenis akan tolak-menolak, sedangkan muatan yang berlainan jenis akan tarik-menarik. Dari hasil percobaan Coulomb, dapat dinyatakan bunyi Hukum Coulomb sebagai berikut:
Misalnya, ada dua muatan, yaitu q1 dan q2 yang berada pada jarak r satu sama lain dalam ruang hampa udara. Jika q1 dan q2 memiliki muatan yang sama, maka kedua muatan akan saling tolak-menolak. Contohnya seperti yang ditunjukkan pada gambar (a) dan (b), ya.
Pada gambar (a), muatan q1 dan q2 sama-sama positif. Makanya, muatan q1 mendapat gaya tolakan sebesar F12 ke kiri akibat interaksi dengan muatan q2. Sementara itu, muatan q2 mendapat gaya tolakan F21 ke kanan akibat interaksi dengan muatan q1. Begitupun yang terjadi pada gambar (b). Muatan q1 dan q2 sama-sama bernilai negatif, sehingga terjadi gaya tolak menolak pada masing-masing muatannya.
Sebaliknya ya, jika q1 dan q2 memiliki muatan yang berbeda, maka kedua muatan akan saling tarik-menarik. Contohnya seperti pada gambar (c). Muatan q1 positif dan muatan q2 negatif, sehingga terjadi interaksi saling tarik menarik antar dua muatan. Muatan q1 ditarik oleh muatan q2 dengan gaya F12 ke kanan, sedangkan muatan q2 ditarik oleh muatan q1 dengan gaya F21 ke kiri.
Nah, konsep di atas ini harus benar-benar kamu pahami karena sangat berguna untuk menentukan interaksi lebih dari dua muatan.
Baca Juga: Transistor, Si Kecil Pendobrak Zaman
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Sampai sini, sudah mulai paham belum dengan materi Hukum Coulomb? Kalo masih ada poin-poin yang belum kamu mengerti, mending belajar sama ahlinya, deh. Belajar bareng kakak-kakak pengajar di Ruangguru Privat Fisika misalnya. Hehehe…
Belajar nggak cuma menyenangkan, tapi kamu juga bakal diajari konsepnya sampai paham! Para pengajar di Ruangguru Privat juga sudah terstandarisasi kualitasnya, loh. Kamu juga bisa pilih nih, mau diajarkan secara langsung (offline) atau daring (online). Fleksibel, kan? Untuk info lebih lanjut, cuss klik link berikut!
Rumus Hukum Coulomb
Lalu, mungkin di antara kamu ada yang bertanya, bagaimana dengan gaya yang dihasilkan oleh masing-masing muatan? Dalam kasus di atas, berarti nilai F12 dan F21. Menurut Hukum Coulomb, gaya yang dihasilkan oleh interaksi dua muatan tersebut akan bernilai sama (F12 = F21). Besar gaya Coulomb antar dua muatan listrik dapat ditentukan menggunakan rumus berikut ini:
Nah, gaya Coulomb dipengaruhi oleh konstanta Coulomb (k) yang nilainya bergantung dengan permitivitas medium. Kalau kedua muatannya itu berada dalam medium udara, maka nilai konstanta Coulomb-nya adalah k≈ 9×109N⋅m2/C2.
Contoh Soal Hukum Coulomb
Untuk lebih memahami Hukum Coulomb, yuk kita bahas bersama contoh soal dibawah ini!
Dua buah titik A dan B berjarak 3 meter, masing-masing bermuatan listrik +4 x 10-4 C dan -1 x 10-4 C. Titik C terletak di antara A dan B, berjarak 2 meter dari A dan bemuatan listrik +3 x 10-5 C. hitung besar gaya elektrostatis pada muatan di C!
Pembahasan:
Diketahui:
qA = +4 x 10-4 C
qB = -1 x 10-4 C
qC = +3 x 10-5 C
rCA = 2 m
rBA = 3m
Ditanya: FC ?
Jawab:
Muatan qC ditolak qA ke kanan karena kedua muatan sejenis tetapi ditarik ke kanan oleh muatan qB karena berlawanan jenis. Jadi gaya elektrostatis FC adalah:
Jadi, besar gaya Coulomb di titik C adalah 54 N ke arah kanan.
Nah, sekarang kamu sudah paham kan pengertian hukum Coulomb, rumus, dan contoh soalnya? Kamu masih punya pertanyaan atau soal-soal tentang Hukum Coulomb ini? Langsung saja tanyakan melalui roboguru plus. Kamu tinggal foto soal-soal yang ingin ditanyakan, dan gurumu akan langsung menjawab pertanyaan kamu. Seru dan mudah, kan? Yuk, daftar sekarang juga!
Referensi:
Rosyid MF, Budhi RH, Resmiyanto R, Prastya DS. (2008) Kajian Konsep Fisika 3 untuk Kelas XII SMA dan MA. PT Tiga Serangkai Pustaka Mandiri.
Konsep dan Contoh Soal Hukum Coulomb [Daring]. Tautan: https://www.lakonfisika.net/2019/07/konsep-contoh-soal-hukum-coulomb-gaya-coulomb.html (Diakses pada 5 Agustus 2021)
Sumber Gambar:
Foto ‘Charles Augustin de Coulomb’ [Daring]. Tautan: https://nationalmaglab.org/education/magnet-academy/history-of-electricity-magnetism/pioneers/charles-augustin-de-coulomb (Diakses pada 4 Agustus 2021)
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<h1 class="content-title">
Hukum Coulomb: Pengertian, Rumus, dan Contoh Soal | Fisika Kelas 12 </h1>
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<p class="content-author"><a href="https://www.ruangguru.com/blog/author/karina-dwi-adistiana" class="">Karina Dwi Adistiana</a> </p>
<p class="content-info"><span>September 25, 2024 • </span> <span>4 minutes read</span></p>
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<p><img decoding="async" style="width: 820px; margin-left: auto; margin-right: auto; display: block;" src="https://cdn-web.ruangguru.com/landing-pages/assets/hs/FIS12%20-%20Hukum%20Coulomb%20Pengertian%2c%20Rumus%2c%20dan%20Contoh%20Soal-01.jpg" alt="Hukum Coulomb" /></p>
<blockquote>
<p style="text-align: center;"><em>Di <strong><a href="https://www.ruangguru.com/blog/c/fisika-sma-kelas-12">artikel Fisika kelas 12</a></strong> kali ini, kita akan mempelajari tentang <strong>Hukum Coulomb</strong> secara lengkap, disertai dengan rumus dan pembahasan soalnya. </em></p>
</blockquote>
<p style="text-align: center;">—</p>
<p> </p>
<p style="text-align: justify;"><em>Guys</em>, kamu sudah tahu kan bahwa muatan listrik terdiri dari muatan positif dan negatif? Ternyata, muatan-muatan tersebut bisa menghasilkan gaya, lho! Yup, Hukum Coulomb-lah yang menjelaskan gaya yang terjadi antara muatan-muatan tersebut.</p>
<p style="text-align: justify;">Nah, materi mengenai Hukum Coulomb sebenarnya sudah pernah kita pelajar di kelas 9, lho! Biar nggak lupa, kamu bisa cek materinya <strong><a href="/blog/hukum-coulomb" target="_blank" rel="noopener">di sini</a></strong> yah guys. Di kelas 12 sekarang ini, saatnya kita belajar Hukum Coulomb lebih dalam lagi. Simak pembahasan berikut, kuy!</p>
<p> </p>
<h2><span style="font-size: 18pt;">Mengenal Hukum Coulomb</span></h2>
<p style="text-align: justify;">Hukum Coulomb ditemukan oleh ahli fisika asal Prancis yang bernama <strong>Charles Augustin de Coulomb</strong>. Coulomb melakukan penelitan mengenai gaya yang ditimbulkan oleh dua benda yang diberi muatan listrik dan dipisahkan oleh jarak tertentu.</p>
<p style="text-align: justify;">Hukum Coulomb pada dasarnya menyatakan bahwa <span style="font-weight: bold;">interaksi muatan listrik yang sejenis akan tolak-menolak, sedangkan muatan yang berlainan jenis akan tarik-menarik</span>. Dari hasil percobaan Coulomb, dapat dinyatakan <span style="font-weight: normal;">bunyi Hukum Coulomb</span> sebagai berikut:</p>
<p><img decoding="async" style="width: 600px; margin-left: auto; margin-right: auto; display: block;" src="https://cdn-web.ruangguru.com/landing-pages/assets/hs/FIS12%20-%20Hukum%20Coulomb%20Pengertian%2c%20Rumus%2c%20dan%20Contoh%20Soal-03.jpg" alt="Charles Coulomb" width="600" /></p>
<p> </p>
<p style="text-align: justify;">Misalnya, ada dua muatan, yaitu <span style="font-weight: normal;">q<sub>1</sub> dan q<sub>2</sub> yang berada pada jarak r </span>satu sama lain dalam ruang hampa udara. Jika <span style="font-weight: normal;">q<sub>1</sub> dan q<sub>2</sub> </span>memiliki muatan yang sama, maka kedua muatan akan saling tolak-menolak. Contohnya seperti yang ditunjukkan pada gambar (a) dan (b), ya.</p>
<p style="text-align: justify;">Pada gambar (a), muatan q<sub>1</sub> dan q<sub>2</sub> sama-sama positif. Makanya, muatan <span id="MathJax-Element-3-Frame" tabindex="0"><span id="MathJax-Span-23"><span id="MathJax-Span-24"><span id="MathJax-Span-25"><span id="MathJax-Span-26"><span id="MathJax-Span-27"><span id="MathJax-Span-28"><span id="MathJax-Span-29"><span id="MathJax-Span-30">q</span></span></span><sub><span id="MathJax-Span-31"><span id="MathJax-Span-32"><span id="MathJax-Span-33">1</span></span></span></sub></span></span></span></span></span></span> mendapat gaya tolakan sebesar <span id="MathJax-Element-4-Frame" tabindex="0"><span id="MathJax-Span-34"><span id="MathJax-Span-35"><span id="MathJax-Span-36"><span id="MathJax-Span-37"><span id="MathJax-Span-38"><span id="MathJax-Span-39"><span id="MathJax-Span-40"><span id="MathJax-Span-41">F</span></span></span><sub><span id="MathJax-Span-42"><span id="MathJax-Span-43"><span id="MathJax-Span-44">12</span></span></span></sub></span></span></span></span></span></span> ke kiri akibat interaksi dengan muatan <span id="MathJax-Element-5-Frame" tabindex="0"><span id="MathJax-Span-45"><span id="MathJax-Span-46"><span id="MathJax-Span-47"><span id="MathJax-Span-48"><span id="MathJax-Span-49"><span id="MathJax-Span-50"><span id="MathJax-Span-51"><span id="MathJax-Span-52">q</span></span></span><sub><span id="MathJax-Span-53"><span id="MathJax-Span-54"><span id="MathJax-Span-55">2</span></span></span></sub></span></span></span></span></span></span>. Sementara itu, muatan <span id="MathJax-Element-6-Frame" tabindex="0"><span id="MathJax-Span-56"><span id="MathJax-Span-57"><span id="MathJax-Span-58"><span id="MathJax-Span-59"><span id="MathJax-Span-60"><span id="MathJax-Span-61"><span id="MathJax-Span-62"><span id="MathJax-Span-63">q</span></span></span><sub><span id="MathJax-Span-64"><span id="MathJax-Span-65"><span id="MathJax-Span-66">2</span></span></span></sub></span></span></span></span></span></span> mendapat gaya tolakan <span id="MathJax-Element-7-Frame" tabindex="0"><span id="MathJax-Span-67"><span id="MathJax-Span-68"><span id="MathJax-Span-69"><span id="MathJax-Span-70"><span id="MathJax-Span-71"><span id="MathJax-Span-72"><span id="MathJax-Span-73"><span id="MathJax-Span-74">F</span></span></span><sub><span id="MathJax-Span-75"><span id="MathJax-Span-76"><span id="MathJax-Span-77">21</span></span></span></sub></span></span></span></span></span></span> ke kanan akibat interaksi dengan muatan <span id="MathJax-Element-8-Frame" tabindex="0"><span id="MathJax-Span-78"><span id="MathJax-Span-79"><span id="MathJax-Span-80"><span id="MathJax-Span-81"><span id="MathJax-Span-82"><span id="MathJax-Span-83"><span id="MathJax-Span-84"><span id="MathJax-Span-85">q</span></span></span><sub><span id="MathJax-Span-86"><span id="MathJax-Span-87"><span id="MathJax-Span-88">1</span></span></span></sub></span></span></span></span></span></span>. Begitupun yang terjadi pada gambar (b). Muatan q<sub>1</sub> dan q<sub>2</sub> sama-sama bernilai negatif, sehingga terjadi gaya tolak menolak pada masing-masing muatannya.</p>
<p style="text-align: justify;"><img decoding="async" style="width: 600px; margin-left: auto; margin-right: auto; display: block;" src="https://cdn-web.ruangguru.com/landing-pages/assets/hs/FIS12%20-%20Hukum%20Coulomb%20Pengertian%2c%20Rumus%2c%20dan%20Contoh%20Soal-05.jpg" alt="hukum Coulomb" width="600" /></p>
<p> </p>
<p style="text-align: justify;">Sebaliknya ya, jika q<sub>1</sub> dan q<sub>2</sub> memiliki muatan yang berbeda, maka kedua muatan akan saling tarik-menarik. Contohnya seperti pada gambar (c). Muatan q<sub>1</sub> positif dan muatan q<sub>2</sub> negatif, sehingga terjadi interaksi saling tarik menarik antar dua muatan. Muatan <span id="MathJax-Element-11-Frame" tabindex="0"><span id="MathJax-Span-111"><span id="MathJax-Span-112"><span id="MathJax-Span-113"><span id="MathJax-Span-114"><span id="MathJax-Span-115"><span id="MathJax-Span-116"><span id="MathJax-Span-117"><span id="MathJax-Span-118">q</span></span></span><sub><span id="MathJax-Span-119"><span id="MathJax-Span-120"><span id="MathJax-Span-121">1</span></span></span></sub></span></span></span></span></span></span> ditarik oleh muatan <span id="MathJax-Element-12-Frame" tabindex="0"><span id="MathJax-Span-122"><span id="MathJax-Span-123"><span id="MathJax-Span-124"><span id="MathJax-Span-125"><span id="MathJax-Span-126"><span id="MathJax-Span-127"><span id="MathJax-Span-128"><span id="MathJax-Span-129">q</span></span></span><sub><span id="MathJax-Span-130"><span id="MathJax-Span-131"><span id="MathJax-Span-132">2</span></span></span></sub></span></span></span></span></span></span> dengan gaya <span id="MathJax-Element-13-Frame" tabindex="0"><span id="MathJax-Span-133"><span id="MathJax-Span-134"><span id="MathJax-Span-135"><span id="MathJax-Span-136"><span id="MathJax-Span-137"><span id="MathJax-Span-138"><span id="MathJax-Span-139"><span id="MathJax-Span-140">F</span></span></span><sub><span id="MathJax-Span-141"><span id="MathJax-Span-142"><span id="MathJax-Span-143">12</span></span></span></sub></span></span></span></span></span></span> ke kanan, sedangkan muatan <span id="MathJax-Element-14-Frame" tabindex="0"><span id="MathJax-Span-144"><span id="MathJax-Span-145"><span id="MathJax-Span-146"><span id="MathJax-Span-147"><span id="MathJax-Span-148"><span id="MathJax-Span-149"><span id="MathJax-Span-150"><span id="MathJax-Span-151">q</span></span></span><sub><span id="MathJax-Span-152"><span id="MathJax-Span-153"><span id="MathJax-Span-154">2</span></span></span></sub></span></span></span></span></span></span> ditarik oleh muatan <span id="MathJax-Element-15-Frame" tabindex="0"><span id="MathJax-Span-155"><span id="MathJax-Span-156"><span id="MathJax-Span-157"><span id="MathJax-Span-158"><span id="MathJax-Span-159"><span id="MathJax-Span-160"><span id="MathJax-Span-161"><span id="MathJax-Span-162">q</span></span></span><sub><span id="MathJax-Span-163"><span id="MathJax-Span-164"><span id="MathJax-Span-165">1</span></span></span></sub></span></span></span></span></span></span> dengan gaya <span id="MathJax-Element-16-Frame" tabindex="0"><span id="MathJax-Span-166"><span id="MathJax-Span-167"><span id="MathJax-Span-168"><span id="MathJax-Span-169"><span id="MathJax-Span-170"><span id="MathJax-Span-171"><span id="MathJax-Span-172"><span id="MathJax-Span-173">F</span></span></span><sub><span id="MathJax-Span-174"><span id="MathJax-Span-175"><span id="MathJax-Span-176">21</span></span></span></sub></span></span></span></span></span></span> ke kiri.</p>
<p style="text-align: justify;"><em>Nah</em>, konsep di atas ini harus benar-benar kamu pahami karena sangat berguna untuk menentukan interaksi lebih dari dua muatan.</p>
<p><strong>Baca Juga: <a href="/blog/transistor" rel="noopener">Transistor, Si Kecil Pendobrak Zaman</a></strong></p>
<p style="text-align: center;">—</p>
<p style="text-align: justify;">Sampai sini, sudah mulai paham belum dengan materi Hukum Coulomb? Kalo masih ada poin-poin yang belum kamu mengerti, mending belajar sama ahlinya, deh. Belajar bareng kakak-kakak pengajar di <a href="https://www.ruangguru.com/privat/fisika"><strong>Ruangguru Privat Fisika</strong></a> misalnya. Hehehe…</p>
<p style="text-align: justify;">Belajar nggak cuma menyenangkan, tapi kamu juga bakal diajari konsepnya sampai paham! Para pengajar di Ruangguru Privat juga sudah terstandarisasi kualitasnya, loh. Kamu juga bisa pilih nih, mau diajarkan secara langsung (<em>offline</em>) atau daring (<em>online</em>). Fleksibel, kan? Untuk info lebih lanjut, cuss klik link berikut!</p>
<p><a href="https://cta.ruangguru.com/blog-rg10-privat"><img decoding="async" class="aligncenter size-medium" src="https://cdn-web-2.ruangguru.com/landing-pages/assets/94e6e69e-708c-48fc-b4e9-d277c9405371.png" alt="CTA Ruangguru Privat" /></a></p>
<p> </p>
<h2><span style="font-size: 18pt;">Rumus Hukum Coulomb</span></h2>
<p style="font-weight: normal; text-align: justify;"><span style="color: #000000;">Lalu, mungkin di antara kamu ada yang bertanya, bagaimana dengan gaya yang dihasilkan oleh masing-masing muatan? Dalam kasus di atas, berarti nilai F</span><sub>12</sub><span style="color: #000000;"> dan F<sub>21</sub>. Menurut Hukum Coulomb, gaya yang dihasilkan oleh interaksi dua muatan tersebut akan bernilai sama (F<sub>12</sub> = F<sub>21</sub>). Besar gaya Coulomb antar dua muatan listrik dapat ditentukan menggunakan rumus berikut ini:</span></p>
<p><img decoding="async" style="width: 600px; margin-left: auto; margin-right: auto; display: block;" src="https://cdn-web.ruangguru.com/landing-pages/assets/hs/FIS12%20-%20Hukum%20Coulomb%20Pengertian%2c%20Rumus%2c%20dan%20Contoh%20Soal-04.jpg" alt="Rumus hukum Coulomb" width="600" /></p>
<p> </p>
<p style="text-align: justify;">Nah, gaya Coulomb dipengaruhi oleh konstanta Coulomb (k) yang nilainya bergantung dengan permitivitas medium. Kalau kedua muatannya itu berada dalam medium udara, maka nilai konstanta Coulomb-nya adalah <span id="MathJax-Element-20-Frame" tabindex="0"><span id="MathJax-Span-222"><span id="MathJax-Span-223"><span id="MathJax-Span-224">k</span><span id="MathJax-Span-225">≈</span><span id="MathJax-Span-226"> </span><span id="MathJax-Span-227"></span><span id="MathJax-Span-228">9</span><span id="MathJax-Span-229">×</span><span id="MathJax-Span-230"><span id="MathJax-Span-231"><span id="MathJax-Span-232"><span id="MathJax-Span-233"><span id="MathJax-Span-234"><span id="MathJax-Span-235">10</span></span></span><sup><span id="MathJax-Span-236"><span id="MathJax-Span-237"><span id="MathJax-Span-238">9</span></span></span></sup></span></span></span><span id="MathJax-Span-239">N</span><span id="MathJax-Span-240">⋅</span><span id="MathJax-Span-241"><span id="MathJax-Span-242"><span id="MathJax-Span-243"><span id="MathJax-Span-244"><span id="MathJax-Span-245"><span id="MathJax-Span-246"><span id="MathJax-Span-247"><span id="MathJax-Span-248">m</span></span></span><sup><span id="MathJax-Span-249"><span id="MathJax-Span-250"><span id="MathJax-Span-251">2</span></span></span></sup></span></span></span></span></span><span id="MathJax-Span-252"><span id="MathJax-Span-253"><span id="MathJax-Span-254">/</span></span></span><span id="MathJax-Span-255"><span id="MathJax-Span-256"><span id="MathJax-Span-257"><span id="MathJax-Span-258"><span id="MathJax-Span-259"><span id="MathJax-Span-260"><span id="MathJax-Span-261"><span id="MathJax-Span-262">C</span></span></span><span id="MathJax-Span-263"><span id="MathJax-Span-264"><span id="MathJax-Span-265"><sup>2</sup>.</span></span></span></span></span></span></span></span><span id="MathJax-Span-266"></span></span></span></span></p>
<p> </p>
<h2><span style="font-size: 18pt;">Contoh Soal Hukum Coulomb</span></h2>
<p style="text-align: justify;">Untuk lebih memahami Hukum Coulomb, <em>yuk </em>kita bahas bersama contoh soal dibawah ini!</p>
<p style="text-align: justify;"><span style="background-color: transparent; font-size: 1rem; text-align: left;">Dua buah titik A dan B berjarak 3 meter, masing-masing bermuatan listrik +4 x 10<sup>-4</sup> C dan -1 x 10<sup>-4</sup> C. Titik C terletak di antara A dan B, berjarak 2 meter dari A dan bemuatan listrik +3 x 10<sup>-5</sup> C. hitung besar gaya elektrostatis pada muatan di C!</span></p>
<p style="text-align: justify; font-weight: bold;"><span style="background-color: transparent; font-size: 1rem; text-align: left;">Pembahasan:</span></p>
<p><span style="font-weight: normal;">Diketahui:</span></p>
<p>q<sub>A</sub> = +4 x 10<sup>-4</sup> C</p>
<p><span style="background-color: transparent; font-size: 1rem;">q<sub>B</sub> = -1 x 10<sup>-4</sup> C</span></p>
<p><span style="background-color: transparent; font-size: 1rem;">q<sub>C</sub> = +3 x 10<sup>-5</sup> C</span></p>
<p>r<sub>CA</sub> = 2 m</p>
<p>r<sub>BA</sub> = 3m</p>
<p><span style="font-weight: normal;">Ditanya:</span> F<sub>C</sub> ?</p>
<p style="font-weight: bold;">Jawab:</p>
<p><img decoding="async" style="width: 600px; margin-left: auto; margin-right: auto; display: block;" src="https://cdn-web.ruangguru.com/landing-pages/assets/hs/FIS12%20-%20Hukum%20Coulomb%20Pengertian%2c%20Rumus%2c%20dan%20Contoh%20Soal-06.jpg" alt="Hukum Coulomb" width="600" /></p>
<p> </p>
<p style="text-align: justify;">Muatan <span style="font-weight: bold;">q<sub>C</sub> ditolak q<sub>A</sub></span> ke kanan karena kedua muatan sejenis tetapi ditarik ke kanan oleh muatan <span style="font-weight: normal;">q<sub>B</sub></span> karena berlawanan jenis. Jadi gaya elektrostatis<span style="font-weight: normal;"> F<sub>C</sub></span> adalah:</p>
<p><img decoding="async" style="width: 510px;" src="https://cdn-web.ruangguru.com/landing-pages/assets/hs/contoh%20soal%20hukum%20coulomb%202.png" alt="contoh soal hukum coulomb" width="510" /></p>
<p> </p>
<p><strong>Jadi, besar gaya Coulomb di titik C adalah 54 N ke arah kanan.</strong></p>
<p style="text-align: justify;"><em>Nah</em>, sekarang kamu sudah paham <em>kan</em> pengertian hukum Coulomb, rumus, dan contoh soalnya? Kamu masih punya pertanyaan atau soal-soal tentang Hukum Coulomb ini? Langsung saja tanyakan melalui <a style="font-weight: bold;" href="https://api.whatsapp.com/send/?phone=6281578150000&text=ROBOGURU&app_absent=0&hsCtaTracking=19d4813c-1d17-40c2-aafd-8717bd39cd86%7C7a8ca196-dc7c-414b-8405-f26bcab6a94e" target="_blank" rel="noopener">roboguru plus</a>. Kamu tinggal foto soal-soal yang ingin ditanyakan, dan gurumu akan langsung menjawab pertanyaan kamu. Seru dan mudah, <em>kan</em>? <em>Yuk,</em> daftar sekarang juga!</p>
<p style="text-align: justify;"><a class="rg-cta" style="text-align: center;" href="https://www.ruangguru.com/roboguruplus" target="_blank" rel="noopener"><img fetchpriority="high" decoding="async" class="aligncenter" src="https://cdn-web.ruangguru.com/landing-pages/assets/cta/a0a38c01-0a03-4469-8a8f-60dc108e3138.png" alt="IDN CTA Blog roboguru plus Ruangguru" width="820" height="200" /></a></p>
<p style="text-align: justify; font-weight: bold;">Referensi:</p>
<p style="text-align: left;">Rosyid MF, Budhi RH, Resmiyanto R, Prastya DS. (2008) Kajian Konsep Fisika 3 untuk Kelas XII SMA dan MA. PT Tiga Serangkai Pustaka Mandiri.</p>
<p style="text-align: left;">Konsep dan Contoh Soal Hukum Coulomb [Daring]. Tautan: https://www.lakonfisika.net/2019/07/konsep-contoh-soal-hukum-coulomb-gaya-coulomb.html (Diakses pada 5 Agustus 2021)</p>
<p style="text-align: left; font-weight: bold;">Sumber Gambar:</p>
<p style="text-align: left; font-weight: normal;">Foto ‘Charles Augustin de Coulomb’ [Daring]. Tautan: https://nationalmaglab.org/education/magnet-academy/history-of-electricity-magnetism/pioneers/charles-augustin-de-coulomb (Diakses pada 4 Agustus 2021)</p>
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</a>
</li>
<li>
<a target="_blank" rel="nofollow" href="https://play.google.com/store/apps/details?id=com.ruangguru.livestudents&hl=in">
<img src="https://cdn-web-2.ruangguru.com/static/googleplay.png" loading="lazy" alt="Button Google Play Footer " />
</a>
</li>
<li>
<a target="_blank" rel="nofollow" href="https://appgallery.huawei.com/#/app/C102352375">
<img src="https://cdn-web-2.ruangguru.com/static/huawei.png" loading="lazy" alt="Button AppGallery Footer " />
</a>
</li>
</ul>
</div>
</nav>
</div>
</div>
</div>
</div>
<div class="d-lg-none text-center">
<nav class="footer-menu social">
<p class="title">Ikuti Kami</p>
<a target="_blank" href="https://www.instagram.com/ruangguru/">
<picture>
<source srcset="https://cdn-web-2.ruangguru.com/static/instagram.png?height=60&convert=webp" type="image/webp">
<source srcset="https://cdn-web-2.ruangguru.com/static/instagram.png?height=60" type="image/png">
<img src="https://cdn-web-2.ruangguru.com/static/instagram.png" loading="lazy" alt="Logo Instagram Footer" width="32px" height="32px" />
</picture>
</a>
<a target="_blank" href="https://www.facebook.com/ruanggurucom/">
<picture>
<source srcset="https://cdn-web-2.ruangguru.com/static/facebook.png?height=60&convert=webp" type="image/webp">
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<img src="https://cdn-web-2.ruangguru.com/static/facebook.png" loading="lazy" alt="Logo Facebook Footer" width="32px" height="32px" />
</picture>
</a>
<a target="_blank" href="https://twitter.com/ruangguru/">
<picture>
<source srcset="https://cdn-web-2.ruangguru.com/static/twitter.png?height=60&convert=webp" type="image/webp">
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<img src="https://cdn-web-2.ruangguru.com/static/twitter.png" loading=" lazy" alt="Logo Twitter Footer" width="32px" height="32px" />
</picture>
</a>
<a target="_blank" href="https://www.youtube.com/ruangguru">
<picture>
<source srcset="https://cdn-web-2.ruangguru.com/static/youtube.png?height=60&convert=webp" type="image/webp">
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<img src="https://cdn-web-2.ruangguru.com/static/youtube.png" loading=" lazy" alt="Logo Youtube Footer" width="32px" height="32px" />
</picture>
</a>
<a target="_blank" href="https://www.linkedin.com/company/ruangguru-com">
<picture>
<source srcset="https://cdn-web-2.ruangguru.com/static/linkedin.png?height=60&convert=webp" type="image/webp">
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</picture>
</a>
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</picture>
</a>
</nav>
</div>
<p class="footer-copyright">
© 2026 All Rights Reserved PT. Ruang Raya Indonesia
</p>
</div>
<style>
.bantuan-container {
position: relative;
}
.bantuan-element {
position: fixed;
z-index: 999;
display: flex;
align-items: flex-end;
justify-content: flex-end;
cursor: pointer;
transition: all 0.6s ease;
}
.bantuan-top {
bottom: 11rem;
right: 2rem;
}
.bantuan-bottom {
bottom: 2rem;
right: 2rem;
}
.bantuan-top-2 {
bottom: 15rem;
right: 2rem;
}
.bantuan-top-3 {
bottom: 19rem;
right: 2rem;
}
.bantuan-bottom-2 {
bottom: 5rem;
right: 2rem;
}
.bantuan-bottom-3 {
bottom: 8rem;
right: 2rem;
}
@media (min-width: 768px) {
.bantuan-element img {
width: auto;
transition: all 0.4s ease;
}
.bantuan-top img {
width: 140px;
}
.bantuan-bottom img {
width: 140px;
}
.bantuan-top-2 img,
.bantuan-top-3 img {
width: 140px;
}
.bantuan-bottom-2 img,
.bantuan-bottom-3 img {
width: 140px;
}
.bantuan-element.clicked {
bottom: 9rem;
right: 2.5rem;
}
.bantuan-element.clicked img {
width: auto;
height: 64px;
}
}
@media (max-width: 767px) {
.bantuan-top {
bottom: 8rem;
right: 1rem;
align-items: center;
}
.bantuan-bottom {
bottom: 2rem;
right: 1.25rem;
align-items: center;
}
.bantuan-top-2 {
bottom: 12rem;
right: 1rem;
align-items: center;
}
.bantuan-top-3 {
bottom: 16rem;
right: 1rem;
align-items: center;
}
.bantuan-bottom-2 {
bottom: 5rem;
right: 1.25rem;
align-items: center;
}
.bantuan-bottom-3 {
bottom: 8rem;
right: 1.25rem;
align-items: center;
}
.bantuan-element img {
width: auto;
}
.bantuan-top img,
.bantuan-top-2 img,
.bantuan-top-3 img {
width: 96px;
}
.bantuan-bottom img,
.bantuan-bottom-2 img,
.bantuan-bottom-3 img {
width: 96px;
}
}
.bantuan-element:hover {
transform: scale(1.05);
}
.bantuan-element img {
max-width: 100%;
height: auto;
}
</style>
<div id="bantuan-divs-container" style="position: relative" data-product="ruangguru" data-table="rg_floating_icon"></div>
<script>
class FloatingDivsComponent {
constructor(product = 'ruangguru', table = 'rg_floating_icon') {
this.container = document.getElementById('bantuan-divs-container');
this.floatingElements = [];
this.product = product;
this.table = table;
// Configuration
this.config = {
baseApiUrl: 'https://gw.ruangguru.com/api/v3/rdb/p_ddgy8hjx5dxsqx/rg_banner/views/',
apiKey: 'vLyK3dJrDBRmOwueX2OJXibMkgsUbBk0WS4ua2p1',
maxElements: 2,
zIndexBase: 100,
};
// Build dynamic API URL based on table parameter
this.config.apiUrl = this.buildApiUrl();
this.init();
}
buildApiUrl() {
const baseUrl = this.config.baseApiUrl;
const tableName = this.table || 'rg_floating_icon';
const queryParams =
'offset=0&limit=99999&sort=rankPosition&where=(type,eq,floating)~and(showIn,anyof,blog)~and(hide,is,false)~and(product,eq,' +
this.product +
')&nested%5Bcta%5D%5Bfields%5D=Id,name,ctaId,imageUrl,ctaLink,targetUrl';
return `${baseUrl}${tableName}?${queryParams}`;
}
async init() {
try {
await this.fetchFloatingElements();
this.renderFloatingElements();
} catch (error) {
console.error('Failed to initialize floating divs component:', error);
}
}
async fetchFloatingElements() {
try {
const options = {
method: 'GET',
headers: {
'xc-token': this.config.apiKey || 'vLyK3dJrDBRmOwueX2OJXibMkgsUbBk0WS4ua2p1',
},
};
const urlNoco = this.config.apiUrl;
const response = await fetch(urlNoco, options);
if (!response.ok) {
throw new Error(`HTTP error! status: ${response.status}`);
}
const data = await response.json();
this.floatingElements = this.processApiResponse(data);
} catch (error) {
console.error('Error fetching floating elements:', error);
throw error;
}
}
processApiResponse(data) {
if (!data || !data.list || !Array.isArray(data.list)) {
return [];
}
console.log(data.list);
// Ensure we only get maximum 2 elements
const limitedElements = data.list.slice(0, this.config.maxElements);
return limitedElements;
}
renderFloatingElements() {
if (!this.container || this.floatingElements.length === 0) {
return;
}
// Additional safeguard: ensure we never render more than maxElements
const elementsToRender = this.floatingElements.slice(0, this.config.maxElements);
// Clean up existing elements and their event listeners
this.cleanupExistingElements();
// Clear existing content
this.container.innerHTML = '';
elementsToRender.forEach((element, index) => {
const floatingDiv = this.createFloatingDiv(element, index);
this.container.appendChild(floatingDiv);
});
}
cleanupExistingElements() {
// Clear existing elements (no need for event listener cleanup with CSS approach)
const existingElements = this.container.querySelectorAll('[data-floating-element]');
existingElements.forEach(element => {
element.remove();
});
}
createFloatingDiv(element, index) {
const div = document.createElement('div');
const cta = element.cta[0]; // Use the first CTA
// Add data attribute for cleanup tracking
div.setAttribute('data-floating-element', 'true');
// Apply CSS classes based on rankPosition
const positionClass = this.getPositionClass(element.rankPosition, index);
div.className = `bantuan-element ${positionClass}`;
div.style.zIndex = this.config.zIndexBase + index;
// Create the link and image
const link = document.createElement('a');
link.href = 'https://cta.ruangguru.com/' + cta.ctaId || '#';
link.target = '_blank';
// Add tracking attributes
link.setAttribute('data-tracking-event-type', 'landing_page__core__item_click');
link.setAttribute(
'data-tracking-context',
JSON.stringify({
product_name: this.product,
cta_action: 'redirection',
cta_action_detail: link.href,
item_type: 'floating',
item_name: element.name || 'Floating element',
item_category: 'payment',
item_position: index,
item_serial: null,
section_type: 'floating_item',
section_position: 'body',
section_name: 'floating_item',
})
);
const img = document.createElement('img');
img.src = element.imageUrl + '?h=200&convert=webp';
img.alt = element.name || 'Floating element';
img.loading = 'lazy';
// Add click tracking
link.addEventListener('click', () => {
this.trackClick(element, cta);
});
link.appendChild(img);
div.appendChild(link);
return div;
}
getPositionClass(rankPosition, index) {
// Define positioning classes based on rankPosition
if (rankPosition === 1) {
return 'bantuan-top'; // Top position
} else if (rankPosition === 2) {
return 'bantuan-bottom'; // Bottom position
} else {
// For additional elements, distribute them evenly
return `bantuan-${index % 2 === 0 ? 'top' : 'bottom'}-${Math.floor(index / 2) + 1}`;
}
}
trackClick(element, cta) {
// Implement click tracking logic here
console.log('Floating element clicked:', {
elementId: element.Id,
elementName: cta.name,
ctaId: cta.ctaId,
targetUrl: cta.targetUrl,
});
}
// Public method to manually refresh
async refresh() {
try {
await this.fetchFloatingElements();
this.renderFloatingElements();
} catch (error) {
console.error('Failed to refresh floating elements:', error);
throw error;
}
}
// Public method to get current floating elements
getFloatingElements() {
return [...this.floatingElements];
}
}
// Initialize the component when DOM is ready
document.addEventListener('DOMContentLoaded', () => {
// Get product and table parameters from data attributes
const container = document.getElementById('bantuan-divs-container');
const product = container.getAttribute('data-product') || 'ruangguru';
const table = container.getAttribute('data-table') || 'rg_floating_icon';
new FloatingDivsComponent(product, table);
});
// Export for use in other modules if needed
if (typeof module !== 'undefined' && module.exports) {
module.exports = FloatingDivsComponent;
}
</script> <div id="wp-install-nudge" style="
position: fixed;
bottom: 0rem;
right: 0;
z-index: 999;
cursor: pointer;
"></div>
<script>
(function (w, d, s, o, f, js, fjs) {
w['Sales-Nudge-Widget'] = o; w[o] = w[o] || function () { (w[o].q = w[o].q || []).push(arguments) };
js = d.createElement(s), fjs = d.getElementsByTagName(s)[0];
js.id = o; js.src = f; js.async = 1; fjs.parentNode.insertBefore(js, fjs);
}(window, document, 'script', 'wpInstallNudge', 'https://cdn-web-2.ruangguru.com/sales-nudge/6198a95130/dist/widget.js'));
wpInstallNudge('init', { targetElementId: 'wp-install-nudge', clientTarget: 'ruangguru_blog' });
</script>
<script>
// note: disabled due to auto reload page
// var lastScrollTop = 0;
// $(window).scroll(function(event){
// var st = $(this).scrollTop();
// if (st > lastScrollTop){
// $('#wp-install-nudge').slideDown( "slow", function() {});
// } else {
// $('#wp-install-nudge').slideUp( "slow", function() {});
// }
// lastScrollTop = st;
// });
// $(document).ready(function () {
// $("#wp-install-nudge").hide();
// });
$('#wp-install-nudge').click(function(){
Analytics.track("promotion__install_nudge__click",
{
user_email: "ruangguru@blog.com",
cta_link: widgetData.dataConfig.target_link
}).catch((err) => {
console.log("tracker error", err);
});
});
</script>
</footer>
<div id="__next"></div>
<script type="speculationrules">
{"prefetch":[{"source":"document","where":{"and":[{"href_matches":"\/blog\/*"},{"not":{"href_matches":["\/blog\/wp-*.php","\/blog\/wp-admin\/*","\/blog\/wp-content\/uploads\/*","\/blog\/wp-content\/*","\/blog\/wp-content\/plugins\/*","\/blog\/wp-content\/themes\/ruangguru\/*","\/blog\/*\\?(.+)"]}},{"not":{"selector_matches":"a[rel~=\"nofollow\"]"}},{"not":{"selector_matches":".no-prefetch, .no-prefetch a"}}]},"eagerness":"conservative"}]}
</script>
<script>
async function getCtaDetails(ctaIds) {
const endpoint =
" https://gw.ruangguru.com/api/v3/rdb/p_ddgy8hjx5dxsqx/CTA/views/CTA?offset=0&limit=10&where=(ctaId,in," + ctaIds.toString() + ")";
try {
const response = await fetch(endpoint, {
headers: {
"xc-token": "-hG2nBDJzSj0agSgNtcJx97M4F02y54nUMoY6plJ",
},
});
const data = await response.json();
const ctaList = data?.list || [];
const ctaMap = new Map();
for (const ctaData of ctaList) {
ctaMap.set(ctaData.ctaId, ctaData);
}
return ctaMap;
} catch (error) {
console.error("Error fetching CTA details:", error);
return new Map();
}
}
async function replaceCTA() {
const regex = /{{cta\((‘(.*?)’|“(.*?)”)\)}}/g;
const bodyHTML = document.body.innerHTML;
const matches = Array.from(bodyHTML.matchAll(regex));
const ctaIds = matches.map((match) => {
let ctaId = match[2] ?? match[3];
return ctaId;
});
const ctaMap = await getCtaDetails(ctaIds);
const replacedHTML = bodyHTML.replace(regex, (match, _inner, ctaId1, ctaId2) => {
const ctaId = ctaId1 ?? ctaId2;
const ctaData = ctaMap.get(ctaId);
if (ctaData) {
return `<a href="https://cta.ruangguru.com/${ctaData.ctaId}" target="_${ctaData.targetType}" style="position:relative;display:inline-block;">
<img src="${ctaData.imageUrl}" loading="lazy" alt="${ctaData.altText}" />
</a>`;
} else {
return match;
}
});
document.body.innerHTML = replacedHTML;
}
</script>
<meta name="author" content="Ruangguru Tech Team">
<!-- Google Tag Manager (noscript) -->
<noscript><iframe src="https://www.googletagmanager.com/ns.html?id=GTM-PVNLZFT" height="0" width="0" style="display:none;visibility:hidden"></iframe></noscript>
<!-- Tracker -->
<script type="text/javascript" src="https://cdn-web-2.ruangguru.com/landing-page-web/public/staticpages/global-assets/js/cta.js"></script>
<script src="https://unpkg.com/@dotlottie/player-component@latest/dist/dotlottie-player.mjs" type="module"></script>
</body>
</html>