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Q.

The work done in taking a charge q once round a circle of radius r and having a charge Q at the centre is

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a

qQ(4π∈0r2)

b

qQ(4π∈0r)

c

qQ[4π∈0(2πr)]

d

Zero

answer is D.

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Detailed Solution

W=(∆v)q but  Δv=O⇒W=O

If charge is at the center on the circumference all the points are equipotential.

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