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Q.

A charge particle of mass m and charge g travels on a circular path of radius r that is perpendicular to the magnetic. field B. The time taken by the particle to complete one revolution is

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a

2πmqB

b

2πqBm

c

2πmqB

d

2πq2Bm

answer is A.

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Detailed Solution

For magnetic fieldmV2r=qVBor v=qBrmNow T =2πrV=2πrmqBr=2πmqB
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