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Q.

Work done on an electron moving in a solenoid along its axis is equal to :

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a

Zero

b

evB

c

ilB

d

None of these

answer is A.

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Detailed Solution

Magnetic field in the solenoid is along its axis,So,  force on electron when it moves along the axis is ZeroSince   qvBsinθ=0since  θ=0
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