A capacitor is connected across a constant battery
PHYSICS · Subjective · CBSE · Physics · Electrostatic Potential and Capacitance · Electrostatic Potential and Capacitance
Problem
A 5μF capacitor is connected across a constant 300V battery.
(a) Find the energy stored in the capacitor with air between the plates.
(b) Without disconnecting the battery, a dielectric slab of dielectric constant 4 is fully inserted between the plates so that the capacitance becomes four times its original value. Find the new energy stored in the capacitor.
(c) Calculate the work done by the external circuit (battery) during the insertion of the dielectric and state in which form the additional energy supplied by the battery finally appears.