In a parallel-plate capacitor, the region between the plates is filled by a dielectric slab. The capacitor is connected to a cell and the slab is taken out. Then

Options

A. the potential difference across the capacitor reduces.
B. the potential difference across the capacitor increases.
C. the energy stored in the capacitor reduces.
D. no work is done by an external agent in taking the slab out.

Explanation

Analyse the situation gives qualitavely the charge on the plates can not change.