Question

Define cappacitance of a capacitor. Give its SI unit. Derive an expression for the electrostatic energy stored in a charged capacitor

Answer 1

Answer:

Capacitance of a capacitor is defined as the ratio of the charge stored on any of the plates ofcapacitor to the potential between the plates. Parallel Plate Capacitor. ... The Farad, F, is the SI unit for capacitance, and from the definition of capacitance is seen to be equal to a Coulomb/Volt.

Answer 2

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Capacitance or electric capacity indicates the ability of a system to store charge. It is defined as the ratio of charge stored in the conductors to the potential difference across the conductors. Its SI unit is Farad (F). Hence :- C = Q/V

To derive the expression of capacitance of parallel plate capacitor of conductor area A and distance between the conductors as d with a dielectric of dielectric constant K carrying a charge Q and potential difference V, refer to the attached figure.

Electric field between plates of the capacitor can be found using Gauss Law.