Derive an expression for capacitance of the above capacitor with the dielectric slab in between the plates

Obtain an expression for capacitance of a paral lel plate capacitor

Derive an expression for energy stored in a capacitor,

Write down the expression for capacitative reactance of a capacitor.

Write down the expression for the capacitance of a spherical capacitor?

A parallel plate capacitor with air between the plates has a capacitance of 8µF. What will be the capacitance if the distance between the plates is reduced by half and the space between is filled with a medium of dielectric constant 5?

If the dielectric slab is absent and the capacitor is charged to a surface charge density o, the electric field in between the plates is

An electric bulb B and a parallel plate capacitor C are connected in series to an ac source. The bulb glows with some brightness. How will the glow of the bulb affected on introducing a dielectric slab between the plates of the capaci tor? Give reasons in support of your answer.

Write the expression for the effective capacitance of two capacitors connected in parallel.