Parallel plates: Two very large parallel sheets a distance d apart have their centers directly opposite each other. The sheets carry equal but opposite uniform surface charge densities. A point charge that is placed near the middle of the sheets a distance d/2 from each of them feels an electrical force F due to the sheets. If this charge is now moved closer to one of the sheets so that it is a distance d/4 from that sheet, what force will feel?
A) 4F
B) 2F
C) F
D) F/2
E) F/4

Question

Quizplus · Accepted Answer

The electric field between two oppositely charged parallel plates is uniform and does not depend on the distance from the plates. Therefore, the force on the point charge, given by F = qE (where q is the charge and E is the electric field strength), remains constant regardless of the position between the plates.

Parallel Plates: Two Very Large Parallel Sheets a Distance D