Current drawn by the battery just after switch 'S' is closed is :

A parallel plate air capacitor of capacitance $\mathrm{C}$ is connected to a cell of emf $\mathrm{V}$ and then disconnected from it. A dielectric slab of dielectric constant $\mathrm{K}$, which can just fill the air gap of the capacitor, is now inserted in it. Which of the following is incorrect ?

A capacitor of $2 \mathrm{\mu F}$ is charged as shown in the diagram. When the switch $S$ is turned to position $2,$ the percentage of its stored energy dissipated is

A parallel-plate capacitor of area A, plate separation d and capacitance C is filled with four dielectric materials having dielectric constants k₁, k₂, k₃ and k₄ as shown in the figure below. If a single dielectric material is to be used to have the same capacitance C in this capacitor, then its dielectric constant k is given by :-

A capacitor is charged by a battery. The battery is removed and another identical uncharged capacitor is connected in parallel. The total electrostatic energy of resulting system :-

Find the energy stored in the shaded region. If 11 µC charge is placed at centre.

The electrostatic force between the metal plates of an isolated parallel plate capacitor $C$ having a charge $Q$ and area $A$, is