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(D) The correct option is $D$.The magnetic field inside a long current-carrying solenoid is uniform and directed along its axis.When an electron is pr

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

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(D) The correct option is $D$.The magnetic field inside a long current-carrying solenoid is uniform and directed along its axis.When an electron is projected along the axis of the solenoid,its velocity vector $\vec{v}$ is parallel to the magnetic field vector $\vec{B}$.The magnetic force on a moving charge is given by $\vec{F} = q(\vec{v} 	imes \vec{B})$,which has a magnitude $F = qvB \sin 	heta$,where $	heta$ is the angle between the velocity and the magnetic field.Since the electron moves along the axis,$	heta = 0^{\circ}$.Therefore,$F = evB \sin(0^{\circ}) = 0$.Since the net magnetic force acting on the electron is $0$,according to Newton's first law of motion,the electron will continue to move in the same direction with uniform velocity.

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

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