Question

The capacitance of a parallel-plate capacitor is when the region between the plates has air. This region is now filled with a dielectric slab of dielectric constant K. The capacitor is connected to a cell emf and the slab is taken out.

This question has multiple correct options
A

Charge flows through the cell.

B

Energy is absorbed by the cell.

C

The energy stored in the capacitor is reduced by .

D

The external agent has to do amount of work to take the slab out.

Medium

Solution

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Correct options are A) , B) and D)

The capacitance of capacitor with dielectric is
Initial charge on capacitor is
As cell is still connect so potential remain constant.
after slab is taken out the charge on capacitor is
The charge flows through the cell is
Energy absorbed by cell
Energy stored in capacitor
Work done

Solve any question of Electrostatic Potential and Capacitance with:-

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