To a charged particle which is moving with a constant initial velocity vecV, uniform magnetic field is applied in the direction of the velocity

Options

A. The particle moves in a spiral path
B. The particle moves in a circular path
C. The particle moves in a parabolic path
D. There is no change in the motion of the particle

Answer

D

Explanation

Force applied on the moving charged particle
`F=Bqv"sin"theta`
Field is applied in the direction of velocity, Hence `theta=0^(@)`
`F=Bqv"sin"theta`
`F=0`
So, there is no change in the motion of the particle.