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Q.

Work done in carrying a charge q once round a circle of radius r with a charge Q at its centre is

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a

$(\frac{Q q}{4 π ε_{0} r^{2}}) 2 π r$

b

$\frac{Q q}{4 π ε_{0} (2 π r)}$

c

$\frac{Q q}{4 π ε_{0} r}$

d

Zero

answer is B.

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Detailed Solution

The circle is an equipotential curve. Work done to move a charge on the equipotential line is zero.

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