Dua buah muatan listrik masing-masing +3 mikrocoulomb dan +4 mikrocoulomb terpisah pada jarak 3 cm satu sama lain. Jika konstanta gaya Coulomb 9 x 10^9 Nm2/ C2, maka besar gaya tolak-menolak yang dihasilkan kedua muatan adalah ….

Dua buah muatan listrik masing-masing +3 mikrocoulomb dan +4 mikrocoulomb terpisah pada jarak 3 cm satu sama lain. Jika konstanta gaya Coulomb 9 x 10^9 Nm2/ C2, maka besar gaya tolak-menolak yang dihasilkan kedua muatan adalah ….
A. 12 N
C. 120 N
B. 36 N
D. 360 N

Jawaban yang benar adalah C. 120 N

Ingat kembali:
Hukum Coulomb menyatakan bahwa besar gaya tarik-menarik atau tolak-menolak antara dua benda bermuatan listrik berbanding lurus dengan hasil kali kedua muatan tersebut dan berbanding terbalik dengan kuadrat jarak antara dua benda tersebut.
Besar gaya tarik-menarik atau tolak-menolak dirumuskan:
F = (k × q1 × q2)/r²
dimana:
F = gaya tarik-menarik atau tolak-menolak (N)
k = konstanta gaya Coulomb (9 × 10⁹ Nm²/C²)
q1, q2 = besar muatan (C)
r = jarak antar muatan (m)

Diketahui:
q1 = +3 mikrocoulomb = +3 × 10^-6 C
q2 = +4 mikrocoulomb = +4 × 10^-6 C
r = 3 cm = 3 × 10^-2 m
k = 9 × 10⁹ Nm²/C²
Ditanya:
F = …
Jawab:
F = (k × q1 × q2)/r²
F = (9 × 10⁹ × 3 × 10^-6 × 4 × 10^-6)/(3 × 10^-2 )²
F = (108 × 10^-3)/(9 × 10^-4)
F = 12 × 10
F = 120 N

Jadi, besar gaya tolak-menolak yang dihasilkan kedua muatan adalah 120 N
Oleh karena itu, jawaban yang benar adalah C

Rekomendasi lainnya :

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