A charged particle is moving along a magnetic field line. The magnetic force on the particle is

Options

A. along its velocity
B. opposite to its velocity
C. perpendicular to its velocity
D. zero

Answer

D

Explanation

Force on a charge particles in the magnetic field is `vec F = q(vec v xx vec B)`
Here, `theta = 0^@` i.e `vec v` is parallel to `vec B therefore F `= zero