A charged particle moves along a circle under the action of possible constant electric and magnetic fields. Which of the following are possible?

Options

A. `E = 0, B = 0`
B. `E = 0, B != 0`
C. `E != 0, B = 0`
D. `E != 0, B != 0`

Answer

B

Explanation

To move in a circle, a force is required towards centre which will provide necessary centripetal force.
`E != 0`,

Here particle is moving in cirlce but direction of `E` is different at every point, here electric field is non-uniform.