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Question

Two particles A & B having charges +q and 2q. What happens to Electrostatic force between them if the distance between the A & B is halved?

A
It decreases by a factor of 4
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B
It decreases by a factor of 2
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C
It remains the same
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D
It increases by a factor of 2
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E
It increases by a factor of 4
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Solution

The correct option is C It increases by a factor of 4
The electrostatic force between two charges is F=k(q)(2q)r2
When distance r is halved, the force F=k(q)(2q)(r/2)2=4F

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