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Question

Two point charges A and B having charges +q and q  respectively are placed at certain distance apart and force acting between them is F. If 25% charge of A is transferred to B, force between the charges becomes 
  1. F
  2. 9F16
  3. 16F9
  4. 4F3


Solution

The correct option is B 9F16

F =Kq2r2
25% charge from A is transferred to B 


New force F' =K(3q4)(3q4)r2      = 916Kq2r2      = 9F16 

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