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(B) Inside a long current-carrying solenoid,the magnetic field $\vec{B}$ is uniform and directed along the axis of the solenoid.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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(B) Inside a long current-carrying solenoid,the magnetic field $\vec{B}$ is uniform and directed along the axis of the solenoid.When an electron is projected with velocity $\vec{v}$ along the axis,the velocity vector $\vec{v}$ is parallel to the magnetic field vector $\vec{B}$ (i.e.,$\vec{v} \parallel \vec{B}$).The magnetic force $\vec{F}$ on a charged particle moving in a magnetic field is given by $\vec{F} = q(\vec{v} 	imes \vec{B})$.Since $\vec{v}$ and $\vec{B}$ are parallel,the angle between them is $	heta = 0^{\circ}$ or $180^{\circ}$,so $\sin 	heta = 0$.Therefore,the magnetic force $\vec{F} = qvB \sin 	heta = 0$.Since there is no net force acting on the electron,it will continue to move with its initial uniform velocity along the axis of the solenoid.

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

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