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Four equal charges Q are placed at the f...

Four equal charges `Q` are placed at the four corners of a square of each side is 'a'. Work done in removing a charge `-Q` from its centre to infinity is

A

Zero

B

`(sqrt(2) Q^(2))/( 4 pi epsi_(0) a)`

C

`(sqrt(2)Q^(2))/(pi epsi_(0)a)`

D

`(Q^(2))/(2 pi epsi_(0) a)`

Text Solution

Verified by Experts

The correct Answer is:
C
`W=-Q {0-(4Q)/(4 pi e_0 a//sqrt2)} =(sqrt2 Q^2)/( pi e_0 a)`
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