Dear Ashmita,

In that case we use basic defination i.e.

Capacitance

The capacitance (C) is defined as the ratio of the stored charge (Q) to the potential difference (V) between the conductors: 

Capacitance is measured in farads (F) and 1 farad 

Parallel plate capacitor

In its simplest form, the capacitor is a set of oppositely charged parallel plates separated by a distance (d). From the equation for the potential difference of parallel plates and the definition of capacitance, the capacitance for parallel plates is 

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