Question

CLAP-B
1. A charged particle of charge q is moved around a charge + q along a circular path of radius r from A and B. The work done is
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Answer 1

Q -> A charged particle of charge $q_0$ is moved around a charge +q along a circular path of radius r from A and B. The workdone is ..

1. $\frac{1}{4\pi\epsilon_0}\frac{qq_0}{r}$
2. $\frac{1}{4\pi\epsilon_0}\frac{2qq_0}{r}$
3. $\frac{1}{4\pi\epsilon_0}\frac{qq_0}{r}\pi r$
4. zero.

solution : The charged particle is moving on the equipotential surface. I mean, potential at point A = potential at point B.

so potential difference = 0

we know, workdone due to charge is product of charge and potential difference

i.e., W = $q_0$ × ∆V

= $q_0$ × 0

= 0

Therefore workdone is zero. so option (4) is correct choice.