Question

A charged particle moves through a magnetic field in a direction perpendicular to it. Then the 

(a) speed of the particle remains unchanged 

(b) direction of the particle remains unchanged 

(c) acceleration remains unchanged 

(d) velocity remains unchanged

Answer 1

Correct option (a) speed of the particle remains unchanged 

Explanation:

If a moving charged particle is subjected to a perpendicular uniform magnetic field, then according to F = qvB sin θ, it will experience a maximum force which will provide the centripetal force to particle and it will describe a circular path with uniform speed.