A parallel plate capacitor is connected across a battery. Now, keeping the battery connected, a dielectric slab is inserted between the plates. In the process,

Options

A. no work done
B. work is done by the battery and the stored energy increases.
C. work is done by the external agent, and the stored energy decteases. lt
D. work is done by the battery as well as the external agent, but the stored energy done not charge.

Answer

B

Explanation

Extra charge will flow through battery, so work is done by battery. External agent will do negative work.