Question

How does the potential difference change with the effect of the dielectric when the battery is kept disconnected from the capacitor?

(a) Increases

(b) Decreases

(c) Remains constant

(d) Becomes zero

The question was asked during an interview.

I want to ask this question from Effect of Dielectric on Capacitance in division Electrostatic Potential and Capacitance of Physics – Class 12

Answer 1

The correct option is (b) Decreases

Best explanation: When the dielectric slab is introduced between the plates, the induced surface charge on the dielectric reduces the electric field. The reduction in the electric field results in a decrease in potential difference.

V = Ed = \(\frac {E_0 d}{k}=\frac {V_0}{k}\).