Q. An electron moving with velocity along the axis approaches a circular current carrying loop as shown in the figure. The magnitude of magnetic force on electron at this instant is-

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A

B

C

D

none of these

Solution:

The magnetic force on a moving charge in electric field is given by

Where, is the velocity vector and is the magnetic field.
The direction of the magnetic field due to the current-carrying circular loop is along its axis.
As the direction of electron velocity is along magnetic field lines, the magnetic force .

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