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Q.

Four charges are arranged at the corners of a square ABCD of side d as shown in Fig.
What is work required to bring a charge ‘q’ to the centre E of the square from infinity. (four charges being held fixed at its corner). 
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a

q24πϵ0(4−2)

b

−q24πϵ0(4−2)

c

Zero

answer is C.

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Detailed Solution

W=q0VE−V∞=q0(0−0)=0

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