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Question

An electron (mass=9×1031kg,charge=1.6×1019C) 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
  1. 4.5×105T
  2. 1.4×105T
  3. 5.5×105T
  4. 2.6×105T

A
1.4×105T
B
2.6×105T
C
5.5×105T
D
4.5×105T
Solution
Verified by Toppr

Bqv=mv2r or

B=mvrq

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[NCERT 1982; CPMT 1989; DCE 2005]


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