Girls having charges q1 and q2 when kept at a certain distance exert force f on each other if the distance is reduced to half force between them becomes
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the force becomes 4 times as Force is inversely proportional to square of distance between them
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charges are q1 and q2
r=r
F=kq1q2/r²
now r'=r/2
F'=kq1q2/(r/2)²
=4kq1q2/r²
=4F
therefore the force increases by 4 times.
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