A charged particle experiences magnetic force in the presence of magnetic field. Which of the following statement is correct ?

Options

A. The particle is stationary and magnetic field is perpendicular.
B. The particle is moving and magnetic field is perpendicular to the velocity.
C. The particle is stationary and magnetic field is parallel.
D. The particle is moving and magnetic field is parallel to velocity.

Answer

B

Explanation

Magnetic force on the charged particle q is
`vec(F)_(m)=q(vec(v)xxvec(B))` or `F_(m)=q v B sin theta`
where `theta` is the angle between `vec(v)` and `vec(B)`.
Out of the given cases, only in case (b) it will experience the force while in other cases it will experience no force.