Question

Briefly explain the principle of a capacitor. Derive an expression for the capacitance of a parallel plate capacitor, whose plates are separated by a dielectric medium

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Solution

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Principle of a capacitor : A capacitor works on the principle that the capacitance a conductor increases appreciably when an earthed conductor is brought near it.
Parallel Plate Capacitor: Consider a parallel plate capacitor having two plane metallic plates A and B, placed parallel to each other (see fig). The plates carry equal and opposite charges +Q and -Q repectively.
In general, the electric field between the plates due to charges +Q and -Q remains uniform, but at the edges, the electric field lines 
Briefly explain the principle of a capacitor. Derive an expression ...

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