Question

A parallel plate condenser with a dielectric of dielectric constant K between the plates has a capacity C and is charged to a potential V volts. The dielectric slab is slowly removed from between the plates and then reinserted. The net work done by the system in this process is :

• A. (K - 1) CV${}^2$
• B. CV${}^2$ (K - 1) /K
• C. KCV${}^2$
• D. zero

Answer 1

The correct option is D zero

Since here equal and opposite work are done during removal and insertion , so the net work done is zero.