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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 corner 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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