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Q.

There are two equipotential surface with same potential as shown in figure. The distance between them is r. The charge of –q coulomb is taken from the surface A to B, the resultant work done will be

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a

W=14πεoqr

b

W=14πε0qr2

c

W=−14πε0qr2

d

W = zero

answer is D.

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Detailed Solution

The work done  is given by =q(V2−V1)=0
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