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Question

When two charges are equal q each, force they exert on each other is F. When one of the charges is doubled, the 2q charge exerts a force 2F on charge q. The force exerted by q on 2q is :

A
F
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B
F2
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C
F4
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D
2F
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Solution

The correct option is C 2F
Electrostatic force is mutual. Force exerted on charge q due to charge 2q is equal to the force exerted on 2q due to charge q. So, if 2q charge exerts a force 2F on charge q, then the force exerted by q on 2q is also 2F.
Ans:(D)

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