JEE Main 2024 Physics question

An electron is projected with uniform velocity along the axis inside a current carrying long solenoid. Then:

(A)the electron will be accelerated along the axis.
(B)the electron will continue to move with uniform velocity along the axis of the solenoid.Correct
(C)the electron path will be circular about the axis.
(D)the electron will experience a force at 45° to the axis and execute a helical path.

Answer: (B)

Solution

The field inside the solenoid is along its axis, parallel to the velocity, so F = qv × B = 0.

Question ID VK-011398