Roboguru

Pertanyaan

Perhatikan gambar muatan listrik berikut.

Gaya listrik yang dialami muatan q subscript B adalah 8 N begin mathsize 12px style open parentheses 1 mu C space equals space 10 to the power of negative 6 end exponent C close parentheses end style dan begin mathsize 12px style open parentheses k space equals space 9.10 to the power of 9 space N. m squared. C to the power of negative 2 end exponent close parentheses end style. Jika muatan q subscript B digeser menjadi 4 cm dari A, maka gaya listrik yang dialami q subscript B sekarang adalah ...

  1. 2 N

  2. 4 N

  3. 6 N

  4. 8 N

  5. 10 N

A. Muhaemin

Master Teacher

Mahasiswa/Alumni Universitas Negeri Yogyakarta

Jawaban terverifikasi

Pembahasan

Diketahui:

table attributes columnalign right center left columnspacing 0px end attributes row cell straight q subscript straight A end cell equals cell 2 space μC end cell row cell straight F subscript 1 end cell equals cell 8 space straight N end cell row cell straight r subscript 1 end cell equals cell 2 space cm end cell row cell straight r subscript 2 end cell equals cell 4 space cm end cell row straight k equals cell 9 cross times 10 to the power of 9 space Nm squared straight C to the power of negative 2 end exponent end cell row blank blank cell straight F subscript 2 ? end cell end table

Rumus gaya coulomb adalah :

table attributes columnalign right center left columnspacing 0px end attributes row straight F equals cell straight k fraction numerator straight q subscript 1 straight q subscript 2 over denominator straight r squared end fraction end cell row cell straight F subscript 1 over straight F subscript 2 end cell equals cell fraction numerator straight k fraction numerator straight q subscript 1 straight q subscript 2 over denominator straight r subscript 1 superscript 2 end fraction over denominator straight k fraction numerator straight q subscript 1 straight q subscript 2 over denominator straight r subscript 2 superscript 1 end fraction end fraction end cell row cell open parentheses straight F subscript 1 over straight F subscript 2 close parentheses end cell equals cell open parentheses straight r subscript 2 over straight r subscript 1 close parentheses squared space end cell row cell open parentheses 8 over straight F subscript 2 close parentheses end cell equals cell open parentheses 4 over 2 close parentheses squared space end cell row cell 8 over straight F subscript 2 end cell equals cell left parenthesis 2 right parenthesis squared end cell row cell straight F subscript 2 end cell equals cell 8 over 4 end cell row cell straight F subscript 2 end cell equals cell 2 space straight N end cell end table

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