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Four point charges -Q, -q, 2q and 2Q are...

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.

A

Q = -q

B

`Q=-1/q`

C

Q = q

D

`Q=1/q`

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The correct Answer is:
A
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