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A charged particle moves through a magne...

A charged particle moves through a magnetic field perpendicular to its direction. Then

A

The momentum changes but the kinetic energy is constant

B

Both momentum and kinetic energy of the particle are not constant

C

Both momentum and kinetic energy of the particle are constant

D

Kinetic energy changes but the momentum is constant

Text Solution

Verified by Experts

The correct Answer is:
A
In case of motion of a charged particle perpendicular to the motion, i.e., displacement, the work done
`W=intF.ds=intFds cos theta=0` [ as `theta=90^(@)`]
and by work-energy theorem, `W=DeltaKE` the kinetic energy and hence speed v remains constant. But v changes, o momentum changes.
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