MHTCET 26 Apr 2025 Shift 2 Paper

Concept:A dielectric reduces the net electric field between capacitor plates, which lowers the effective potential difference for the same stored charge.Explanation:A dielectric is an insulating material placed between the plates of a capacitor.When inserted, the dielectric becomes polarized and creates an internal electric field that opposes the original field.This reduces the net electric field $E$ inside the capacitor.Since the potential difference is $V = Ed$, a smaller $E$ produces a lower effective potential for the same plate separation $d$.For a fixed charge $Q$ on the plates, the capacitance is given by $C = \frac{Q}{V}$.As $V$ decreases, the capacitance increases according to $C = \kappa C_0$, where $\kappa$ is the dielectric constant and $C_0$ is the capacitance without the dielectric.Thus, the dielectric does not increase the potential, decrease capacitance, or reduce the plate area.Answer:Option A: to reduce the effective potential on plates.