First slide

Magnetic field due to a moving charge

Question

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

Easy

A

Zero
B

evB
C

ilB
D

None of these

Solution

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

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