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The work done is carrying a charge q once round a circle of radius r with a charge Q at the centre is

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$\frac{q Q}{4 π ε_{0} r}$

$\frac{q Q}{4 π ε_{0}} \frac{1}{π r}$

$\frac{q Q}{4 π ε_{0}} (\frac{1}{2 π r})$

Zero

answer is D.

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The work done in carrying a charge in a closed path is zero in a conservative field.

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