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Capacitance is inversely proportional to the distance between the dielectric plates and directly proportional to the surface are of dielectric plates.

The capacitance is measured in Farads ‘F’. Farad is a large unit so we generally use Microfarad (µF) and Picofarad (pF).

1 µF =10^-6F

1 pF = 10^-12 F

The relation between the capacitance, charge and voltage is given by

C = Q/V

Where C = Capacitance of the capacitor

Q = Charge stored by the capacitor

V = Voltage applied across the capacitor

Charge Q = 12 C and

Voltage applied V = 3 V

Now, we have the formula for capacitance,

C =

C = 12/3 = 4 F.

Charge Q = 10 C and

Voltage applied V = 4 V

Now, we have the formula for capacitance,

C =

C = 10/4 = 2.5 F = 2.5 x 10^-6 µF.