A charge Q is divided into two parts of q and Q-q. If the coulomb repulsion between them when they are separated is to be maximum, the ratio of Qq should be
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a
2
b
1/2
c
4
d
1/4
answer is A.
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Detailed Solution
Let separation between two parts be r⇒F=k.q(Q−q)r2For F to be maximum dFdq=0⇒Qq=21