Question

A positively charged particle moving due east
enters a region of uniform magnetic field directed
vertically upwards. This particle will
(a) get deflected in vertically upward direction
(b) move in circular path with an increased
speed
(c) move in a circular path with decreased
speed
(d) move in a circular path with uniform speed

Answer 1

Answer:

option (d)

Explanation:

since Force F = q v×B, force is always perpendicular to the motion. Therefore, work done on it is zero( therefore uniform speed) and the perpendicular force acts as centripetal force and moves the body in a circular path.