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Question

A charged particle of mass m and charge q travels on a circular path of radius r that is perpendicular to a magnetic field B. The time taken by the particle to complete one revolution is :
  1. 2πq2Bm
  2. 2πmqB
  3. 2πmqB
  4. 2πqBm

A
2πq2Bm
B
2πmqB
C
2πmqB
D
2πqBm
Solution
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Equating magnetic force to centripetal force,

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