A negative charge is released from rest in a region between two plates of opposite sign. Which one is correct?

Question

BlackTom AI · Accepted Answer

A negative charge released from rest in a region between two oppositely charged plates will experience a force due to the electric field created by the plates. 
Option a: 'The field is directed toward the positive plate.' In a parallel-plate capacitor, the electric field points from the positive plate to the negative plate. Therefore, this statement is incorrect because the field direction is from + to −, not toward the positive plate itself. 
Option b: 'The velocity of the particle is directed toward the negative plate.' Since the charge starts at rest, its velocity changes due to the electric force. For a negative charge, the force is opposite to the field, so it accelerates toward the positive plate; thus this statement is false. 
Option c: 'The acceleration is directed toward the positive plate.' This is the correct conclusion: the electric force on a negative charge points toward the positive plate, giving acceleration in that direction regardless of the initial motion (which is zero at release). 
Option d: 'The force is directed toward the negative plate.' This reverses the actual direction; the force on a negative charge is toward the positive plate, not toward the negative plate, so this is incorrect. 
In summary, only option c correctly describes the direction of acceleration for a negative charge released between oppositely charged plates; all other statements misstate the field, velocity, or force directions.

A negative charge is released from rest in a region between two plates of opposite sign. Which one is correct?单项选择题

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