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Physics Question on Magnetic Force

The magnitude of the magnetic force on a charge is zero when

A

charge is at rest

B

charge is moving parallel to the field

C

charge is moving perpendicular to the field

D

both when charge is at rest or moving parallel to the field.

Answer

both when charge is at rest or moving parallel to the field.

Explanation

Solution

Magnitude of magnetic force on a moving charge in a external magnetic field is given by
F=qv Bsin⁡θF =qv \, B \sin \theta
Here, FF will be zero if v=0,v = 0, or θ=0∘\theta = 0^{\circ} or 180∘180^{\circ}