A particle is projected in a plane perpendicular to uniform magnetic field. The area bounded by the path described by the particle is proportional to
(a) velocity (b) momentum (c) energy
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(c) energy
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Explanation:
F=qvB
r= mv/qb
areal velocity= πr²/T
=π(mv/qb)²×qb/2πm
=mv²/2qb.
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