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Solution


Q.

An electron is projected with uniform velocity along the axis inside a current-carrying long solenoid. Then                      [2024]
1 the electron will continue to move with uniform velocity along the axis of the solenoid  
2 the electron will be accelerated along the axis  
3 the electron path will be circular about the axis  
4 the electron will experience a force at 45° to the axis and execute a helical path  

Ans.

(1)

The force on a charged particle moving in a magnetic field, F→=q(v→×B→)

Since v→∥B→ so the force on the electron due to the magnetic field is zero.

So it will move along the axis with uniform velocity.