A parallel-plate capacitor has plates of area and separation and is charged to a…

PHYSICS · Multi-part · CBSE · Physics · Electrostatic Potential and Capacitance · Electrostatic Potential and Capacitance

Problem

A parallel-plate capacitor has plates of area

A

and separation

d

and is charged to a potential difference

V

. The charging battery is then disconnected, and the plates are pulled apart until their separation is

2d

. Derive expressions in terms of

A

d

, and

V

for: (a) The new potential difference (b) The initial and final stored energies,

U_i

and

U_f

d

2d