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q1 = q2 = q
r = 3 m
F = 2x10³ N
Dit: q......?
jawab:
F = k.q1.q2/r²
F = k.q.q/r²
F = kq²/r²
q² = F.r²/k
q² = 2x10³ . 3² / 9.10⁹
q² = 2x10⁻⁶
q = √2x10⁻⁶
q = 1,4x10⁻³ C