Question

A charged particle is released from rest in a region of steady and uniform electric and magnetic fields which are parallel to each other . The particle will remove in a
A. Straight lines
B. circle
C. helix
D. cycloid.

Answer 1

Correct Answer - A
`F_(E)=qE` ( force fue to electric field )
`F_(B)=evSsin theta=qvsin0=0 (` Force due to magnetic field )
Force due to magnetic field will make the charged particle released from rest to move in the straight line ( that of electric field ). Since the force due to magnetic field is zero therefore the charged particle will move in a straight line `(a)` is the correct option.