Question

A charged particle is moving through uniform magnetic field, then magnetic field :

• A. Always exerts a force on the particle
• B. Never exerts a force on the particle.
• C. Exerts a force, if the particle is moving along the field.
• D. Exerts a force, if the particle is moving perpendicular to the direction of the field.

Answer 1

The correct option is B Never exerts a force on the particle.

$F=q(\overrightarrow{V}\times \overrightarrow{B})$

$F=qvBsin\theta$

when particle and magnetic are along , then $\theta =0$

so $F=0.$