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Question

(C) An electron carries a negative charge $(q = -e)$.When it enters an electric field $\vec{E}$ with a velocity $\vec{v}$ parallel to the field lines,

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The velocity of the electron will decrease.

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(C) An electron carries a negative charge $(q = -e)$.When it enters an electric field $\vec{E}$ with a velocity $\vec{v}$ parallel to the field lines,the electric force acting on it is given by $\vec{F} = q\vec{E} = -e\vec{E}$.Since the force is in the opposite direction to the electric field lines,the force acts in the direction opposite to the electron's velocity.This force causes a retardation (deceleration) in the electron's motion.Therefore,the velocity of the electron will decrease as it moves through the field.

When an electron enters an electric field with a velocity in the direction of the electric field lines,then.......

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