A parallel-plate

a) Given Area

Voltage V=12V

Separation between the plates d=2mm

Formula used :

Charge of the capacitor can be calculated as

The capacitance of the parallel plate capacitor is given by

Where,

C is the capacitance of the parallel plate capacitor

D is the separation between the capacitor plates

A is the area of a circular plate capacitor

ε₀ is the permittivity of the free space, ε₀=8.85×10^-12 F/m

b) d is decreased to 1.0mm. We have to calculate the extra charge given by the battery to the positive plate.

Extra charge is =

Charge on the capacitor when d = 2mm is =

When d is decreased to 1.00 mm the extra charge given by the battery is =