Assertion: The capacitance of a capacitor remains the same even if the charge is varied on it.

Reason: Capacitance depends upon nearly medium as well as size and shape of capacitor.

Assertion : The force with which one plate of a parallel plate capacitor is attracted towards the other plate is equal to square of surface density per $\epsilon$ per unit area

Reason : The electric field due to one charged plate of the capacitor at the location of the other is equal to surface density per $\epsilon$

Three capacitors, each of capacitance $C$ and of breakdown voltage $V$ are joined in series. The capacitance and breakdown voltage of the combination will be 

A parallel plate  capacitor has uniform electric field  $E$ in the space between the plates.If the distance between the plates is $d$ and area of each plate is  $A$, the energy stored in the capacitor is ;

Two thin dielectric slabs of dielectric constants $K_1$ and $K_2\left({ K}_1<K_2\right)$ are inserted between plates of a parallel plate capacitor, as shown in the figure. The variation of electric field $\text{'}E\text{'}$ between the plates with distance $\text{'}d\text{'}$ as measured from plate $P$ is correctly shown by: