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Pertanyaan

Titik A pada jarak 2 m dari muatan 1 = 400 μC, 3 m terhadap muatan 2 = – 600 μC, dan 4 m terhadap muatan 3. Jika diketahui energi potensial pada muatan – 200 μC yang diletakkan di titik A adalah 18 x 105 J maka besar muatan 3 adalah ….

  1. -2 C

  2. -4 C

  3. -6 C

  4. -8 C

  5. -10 C

A. Qohar

Master Teacher

Mahasiswa/Alumni Universitas Negeri Semarang

Jawaban terverifikasi

Pembahasan

Diketahui space colon space space straight Q subscript 1 space equals space 400 space μC space equals space 4 space straight x space 10 to the power of negative 4 end exponent space straight C space space straight Q subscript 2 space equals space minus space 600 space μC space equals space minus 6 space straight x space 10 to the power of negative 4 end exponent space straight C space space straight r subscript 1 space equals space 2 space straight m space space straight r subscript 2 space equals space 3 space straight m space straight r subscript 3 space equals space 4 space straight m space space straight E subscript straight p space space equals space 18 space straight x space 10 to the power of 5 space straight J space space straight q space equals space minus space 200 space μC space equals space minus 2 space straight x space 10 to the power of negative 4 end exponent space straight C space space Ditanya space colon space straight Q subscript 3 space ?

E p subscript A equals E p subscript 1 plus E p subscript 2 plus E p subscript 3 E p subscript A equals k q open parentheses Q subscript 1 over r subscript 1 plus Q subscript 2 over r subscript 2 plus Q subscript 3 over r subscript 3 close parentheses 18 space x space 10 to the power of 5 equals left parenthesis 9 space x space 10 to the power of 9 right parenthesis left parenthesis negative 2 space x space 10 to the power of negative 4 end exponent right parenthesis open parentheses fraction numerator 4 space x space 10 to the power of negative 4 end exponent over denominator 2 end fraction plus fraction numerator negative 6 space x space 10 to the power of negative 4 end exponent over denominator 3 end fraction plus Q subscript 3 over 4 close parentheses 18 space x space 10 to the power of 5 equals negative 18 space x space 10 to the power of 5 open parentheses 2 space x space 10 to the power of negative 4 end exponent minus 2 space x space 10 to the power of negative 4 end exponent plus Q subscript 3 over 4 close parentheses 18 space x space 10 to the power of 5 equals negative 18 space x space 10 to the power of 5 x Q subscript 3 over 4 72 space x space 10 to the power of 5 equals negative 18 space x space 10 to the power of 5 x Q subscript 3 Q subscript 3 equals fraction numerator 72 space x space 10 to the power of 5 over denominator negative 18 space x space 10 to the power of 5 end fraction Q subscript 3 equals negative 4 space C

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Titik A berjarak 1 m dari muatan +8 μC, 2 m terhadap muatan −6 μC, dan 3 m terhadap muatan −10 μC. Tentukan energi potensial pada muatan −2 μC yang diletakkan di titik A!

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