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Four charges equal to -Q are placed at t...

Four charges equal to `-Q` are placed at the four corners of a square and a charge q is at its centre. If the system is in equilibrium the value of q is

A

`- (Q)/(4) (1 + 2 sqrt(2))`

B

`(Q)/(4) (1 + 2 sqrt(2))`

C

`- (Q)/(4) (1 + 2 sqrt(2))`

D

`(Q)/(2) (1 + 2 sqrt(2))`

Text Solution

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The correct Answer is:
B
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