Derive an expression for the capacitance of a parallel plate capacitor.

(a) Derive the expression for the capacitance of a parallel plate capacitor having plate area A and plate separation d. (b) Two charged spherical conductors of radii R_(1) and R_(2) when connected by a conducting wire acquire charges q_(1) and q_(2) respectively. Find the ratio of their surface charge densities in terms of their radii.

What is a parallel plate capacitor? Obtain an expression for the capacitance of a parallel plate capacitor when a conducting slab is inserted between its plates.

Find an expression for the capacitance of a parallel plate capacitor when a dielectric slab of dielectric constant K and thickness t=(d)/(2) but the same area on the plates is inserted between the the capacitors plate. (d=separation between the plates)

(a) Derive an expression for energy density of a parallel plate capacitor. (b) Radius of a spherical conductor is 9 cm. A+4muC charge is given to it. Calculate the capacitance of conductor.

Derive an expression for energy density of a parallel plate capacitor.

In what form of field, is the energy of a capacitor stored? Derive an expression for energy of a parallel plate capacitor.