1. | continuously increases. |
2. | continuously decreases. |
3. | increases then decreases. |
4. | decreases then increases. |
A point charge \(q\) is rotated along a circle in the electric field generated by another point charge \(Q\). The work done by the electric field on the rotating charge in one complete revolution is:
1. | zero. |
2. | positive. |
3. | negative. |
4. | zero if the charge \(Q\) is at the centre and non-zero otherwise. |
The energy density in the electric field created by a point charge falls off with the distance from the point charge as
1. \(1 \over r\)
2. \(1 \over r^2\)
3. \(1 \over r^3\)
4. \(1 \over r^4\)