A charger q is placed at the centre of circle of radius r. Then work done by charge Q in completing one round is:

Question

A charger q is placed at the centre of circle of radius r. Then work done by charge Q in completing one round is: (A)  (Q/4π ε 0r)  (B)  (Qq/4π ε 0r)  (C) zero (D)  (2q/2r)

Tardigrade Admin · Accepted Answer

To move on a circular path, work done is zero because displacement is zero.

Q. A charger $q$ is placed at the centre of circle of radius r. Then work done by charge Q in completing one round is:

$\frac{Q}{4 π ε _{0} r}$

$\frac{Qq}{4 π ε _{0} r}$

zero

$\frac{2 q}{2 r}$

To move on a circular path, work done is zero because displacement is zero.

Q. A charger q is placed at the centre of circle of radius r. Then work done by charge Q in completing one round is:

4πε0​rQ​

4πε0​rQq​

zero

2r2q​

To move on a circular path, work done is zero because displacement is zero.

Q. A charger $q$ is placed at the centre of circle of radius r. Then work done by charge Q in completing one round is:

$\frac{Q}{4 π ε _{0} r}$

$\frac{Qq}{4 π ε _{0} r}$

$\frac{2 q}{2 r}$