Q. A particle of mass and moving with velocity describes a circular path of radius when subjected to a uniform transverse magnetic field of induction . the work done by the field when the particle completes one full circle is

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A

B

Zero

C

D

Solution:

When particle describes circular path in a magnetic field, its velocity is always perpendicular to the magnetic force.
Power,
Here
P = 0
But

Hence, work done
W = 0 (Everywhere)

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