Electrostatics Question 186

Question: A charge Q is divided into two parts of q and Qq . If the coulomb repulsion between them when they are separated is to be maximum, the ratio of Qq should be [MP PET 1997]

Options:

A) 2

B) 1/2

C) 4

D) 1/4

Show Answer

Answer:

Correct Answer: A

Solution:

Let separation between two parts be r therefore F=k.q(Qq)r2

For F to be maximum dFdq=0

therefore Qq=21



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