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Question

An electron (mass=9×10−31kg,charge=1.6×10−19C) moving with a velocity of 106m/s enters a magnetic field. If it describes a circle of radius 0.1, then strength of magnetic field must be4.5×10−5T1.4×10−5T5.5×10−5T2.6×10−5T

A
1.4×105T
B
2.6×105T
C
5.5×105T
D
4.5×105T
Solution
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Bqv=mv2r or B=mvrq

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