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in Physics by (25.1k points)
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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