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Question

An electron is projected with a velocity 3×1010ms1 at right angle to a uniform magnetic field of induction 0.2T. The radius of the orbit that the electron revolves is
(Charge of e=1.6×1019C, me=9.1×1031kg )

A
0.68m
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B
0.42m
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C
0.24m
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D
0.84m
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Solution

The correct option is C 0.84m
r=mvqB
=9.1×1031×3×10101.6×1019×0.2=0.84m

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