Question

when the distance between two charged particle is Halved the force between them become

Answer 1

it will become four times as force is inversely proportional to square of distance
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Answer 2

electrostatic force obeys inverse square law.
I. e,.
$f \alpha \frac{1}{r {}^{2} }$
hence when r=r/2
$f \alpha \frac{4}{ {r}^{2} }$
so force becomes 4 times of earlier....



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