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Question

An ideal solenoid carries a current 4 A. Number of turns per unit length is 1500. An electron is projected in solenoid along direction perpendicular to axis, find frequency of electron in rev/s.

A
4.5 × 106
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B
6 × 108
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C
2 × 108
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D
3 × 108
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Solution

The correct option is C 2 × 108
B = μnir = mVqBT = 2πmqBn= 1T= qB2πm= qμni2πm

Putting values of respective variables and constants, we get n = 2 × 108 rev/s

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