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Question

Two positive point charges q1 and q2 are kept at the distance d. If the distance between them is triple. Calculate by which factor new electrostatic force is decreased.

A
3
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B
6
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C
8
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D
9
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E
12
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Solution

The correct option is B 9
By coulomb's law, the force between the charges is F=kq1q2r2
When r=3r,F=kq1q29r2=F/9


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