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Q.

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

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a

Q = q

b

Q=1q

c

Q = -q

d

Q=-1q

answer is C.

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Detailed Solution

∵Distances from charges are equal so at centrePotential ∝∑  chargeSo - Q - q + 2 q + 2Q = 0⇒ q = - Q
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