A parallel plate capacitor with air as dielectric is charged by a $dc$ source to a potential $V,$ without disconnecting the capacitor from the source, air is replaced by another dielectric medium of dielectric constant $K.$ State with reasons how does

capacity,

A parallel plate capacitor with air as dielectric is charged by a $dc$ source to a potential $V,$ without disconnecting the capacitor from the source, air is replaced by another dielectric medium of dielectric constant $K.$ State with reasons how does energy stored in the capacitor changed.

A parallel plate capacitor is charged by a battery. After some time, the battery is disconnected and a dielectric slab with its thickness equal to the plate separation is inserted between the plates. How will be The capacitance of the capacitor,

A parallel plate capacitor is charged by a battery. After some time, the battery is disconnected and a dielectric slab with its thickness equal to the plate separation is inserted between the plates. How will be the Potential difference between the plates

A parallel plate capacitor is charged by a battery. After some time, the battery is disconnected and a dielectric slab with its thickness equal to the plate separation is inserted between the plates. How will the energy stored in the capacitor be affected?

Explain the underlying principle of working a parallel plate capacitor. If two similar plates, each of area $A$ having surface charge densities $+\sigma$ and $-\sigma$ are separated by a distance $d$ in air, write expressions for

the electric field at points between the two plates

the potential difference between the plates and

capacity of the capacitor so formed.

Explain the underlying principle of working a parallel plate capacitor. If two similar plates, each of area $A$ having surface charge densities $+\sigma$ and $-\sigma$ are separated by a distance $d$ in air, write expressions for the potential difference between the plates.

Explain the underlying principle of working a parallel plate capacitor. If two similar plates, each of area $A$ having surface charge densities $+\sigma$ and $-\sigma$ are separated by a distance $d$ in air, write expressions for capacity of the capacitor so formed.

Deduce an expression for the electrostatic energy stored in a capacitor of capacitance $C$ and having charge $Q.$ How will the energy stored?