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Dua buah benda A dan B bermuatan , mula-mula ditem...

Dua buah benda A dan B bermuatan , mula-mula ditempatkan pada pada jarak 0,5m satu sama lain sehingga timbul gaya 81 N. Jika jarak A dan B diperbesar menjadi 1,5 m, gaya tarik-menarik keduanya menjadi ....Error converting from MathML to accessible text.

  1. 3 N

  2. 6 N

  3. 9 N

  4. 12 N

  5. 15 N

Jawaban:

straight F subscript 1 equals space 81 space straight N  straight r subscript 1 equals space 0 comma 5 space straight m  straight r subscript 2 equals space 1 comma 5 space straight m  straight F subscript 2 space equals ? end subscript

Rumus space gaya space coulomb space adalah colon  straight F equals space straight k fraction numerator straight q subscript 1 straight q subscript 2 over denominator straight r squared end fraction  straight F subscript 1 over straight F subscript 2 equals fraction numerator space straight k fraction numerator straight q subscript 1 straight q subscript 2 over denominator straight r subscript 1 squared end fraction over denominator space straight k fraction numerator straight q subscript 1 straight q subscript 2 over denominator straight r subscript 2 squared end fraction end fraction  left parenthesis straight F subscript 1 over straight F subscript 2 right parenthesis equals left parenthesis straight r subscript 1 over straight r subscript 2 right parenthesis squared  left parenthesis 81 over straight F subscript 2 right parenthesis equals left parenthesis fraction numerator 1 comma 5 over denominator 0 comma 5 end fraction right parenthesis squared  fraction numerator 81 space over denominator straight F subscript 2 end fraction equals fraction numerator 2 comma 25 over denominator 0 comma 25 end fraction  81 over straight F subscript 2 equals 9 over 1  straight F subscript 2 equals 81 over 9  straight F subscript 2 equals 9 space straight N

 

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