Question

When the potential gradient increases, what happens to the force between the plates?

(a) Increases

(b) Decreases

(c) Remains the same

(d) becomes zero

This question was posed to me during an interview.

The query is from Force of Attraction Between Oppositely Charged Plates topic in section Capacitance and Capacitors of Basic Electrical Engineering

Answer 1

Right choice is (a) Increases

The explanation is: The force of attraction between the two plates of the capacitor is directly proportional to the square of potential gradient, hence as a potential gradient increases, the force of attraction also increases.