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Q.

Four point charges -Q,-q,2q and 2Q are placed, one at each corner of the square. The relation between Q and q fo which the potential at the centre of the square is zero, is

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a

Q=−q

b

Q = q

c

Q=−1q

d

Q=1q

answer is C.

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Detailed Solution

Let the side of the square be = a Potential at centre
Ve=K×−Qa2+K×−qa2+K×2qa2+K×2qa2
O=KQa2+Kqa2
=Q=−q

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