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 be

4.5×10−5T

1.4×10−5T

5.5×10−5T

2.6×10−5T

A

1.4×10−5T

B

2.6×10−5T

C

5.5×10−5T

D

4.5×10−5T

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Solution

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Bqv=mv2r or

B=mvrq

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