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q2 = -15×10^-6
r=20 cm = 0,2 m
dit = F....?
cara
F = K*q1*q2/r^2
F = 9*10^9*24*10^-6*-15^-6/0,2^2
F = -3240*10^-3/0,04
F = -81.000*10^-3
F = -81 N atau 81 N kemuatan negatif
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