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Two point charges +q1 and +q2 are placed...

Two point charges `+q_1` and `+q_2` are placed a finite distance 'd' apart. It is desired to put a third charge `q_3` in between these two charges so that `q_3` is in equilibrium. This is

A

A. possible only if `q_3` is negative.

B

B. possible only if `q_3` is positive

C

C. possible irrespective of the sign of `q_3`.

D

D. not possible at all.

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