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Q.

Four equal charges Q are placed at the four corners of a square of each side is ‘a’.  Workdone in moving a charge ‘-Q’ from its centre to infinity.  

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a

Zero

b

2 Q24π∈0a

c

2 Q2π∈0a

d

2 Q22π∈0a

answer is C.

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Detailed Solution

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Potential at center of square
V=−2Qπϵ0aPE=V(−Q)

⇒PE=-2Qπε0a×-Q=2Q2πε0a

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