18.2.2—The effect of a uniform electric field on the motion of charged particles

A charge in a uniform field feels F=qE, so if q and mass are constant its acceleration is constant and directed with or against E according to charge sign.

Resolve initial velocity into components: the field changes the component along its force while perpendicular motion remains uniform in the ideal model.

An electron entering a uniform vertical field follows a curved path because horizontal velocity persists while vertical acceleration acts.

A negative charge accelerates opposite the field direction; the field does not automatically stop all motion.