Q. 4

An electron is projected with uniform velocity along the axis of a current carrying long solenoid. Which of the following is true?
The electron will be accelerated along the axis.

B. The electron path will be circular about the axis.

C. The electron will experience a force at 45° to the axis and hence execute a helical path.

D. The electron will continue to move with uniform velocity along the axis of the solenoid.

Answer :

We know that in a current carrying long solenoid the magnetic field is only inside the solenoid and parallel to the axis. Therefore, when electron is projected with uniform velocity along the axis of a current carrying long solenoid it will experience a force due to the magnetic field in there, which will be parallel to the axis. And due to this force along the axis the electron will accelerate along the axis.


Hence, our answer will be option (a).

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