Q.

A particle having a charge of 100µC and mass of 10mg is projected in a uniform magnetic field of 25 Tesla, with a speed of 10ms–1. The velocity is perpendicular to the field. The radius of path and period of revolution are

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a

4m, 25 millisec

b

4cm, 25sec

c

4m, 25sec

d

4cm,25×103sec

answer is C.

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Detailed Solution

r=mvqB,T=2πrvr=10×106×10100×106×25=125m=10025=4cmT=2π×125×10=25×103sec

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