When a charged particle moves in an elecltric or a magnetic field, its speed is `v` and acceleration is `a`

Options

A. In a magnetic field `v` is constant if the particle moves in a circular path, and variable if it moves in a helical path.
B. In a magnetic field, `v` is always constant `a` may or may not ber zero
C. In an electric field, `v` can never remain constant.
D. In a uniform electric field, `a` must be constant in magnitude and direction.

Answer

B, C, D