A variable capacitor is kept connected to a 10 V battery, if the capacitance of the capcitor is changed from `7muF` to `3muF`, what is the change in the energy?

A 30 muF capacitor is connected to a 220V , 50 Hz source Find its impedance of the circuit.

A 12pF capacitor is connected to a 50V battery. How much electrostatic energy is stored in the capacitor?

The capacitance of a variable radio capacitor can be cahanged from 50pF to 200pF by turning the dial from 0^(@) to 180^(@) . With the dial set at 180^(@) , the capacitor is connected to a 400V battery. After cahrging, the capacitor is disconnected from the battery and dial is tuned at 0^(@) ? (a) what is the p.d. across the capacitor when dial reads 0^(@) ?

The capacitance of a variable radio capacitor can be cahanged from 50pF to 200pF by turning the dial from 0^(@) to 180^(@) . With the dial set at 180^(@) , the capacitor is connected to a 400V battery. After cahrging, the capacitor is disconnected from the battery and dial is tuned at 0^(@) ? (b) how much work is required to turn the dial, if friction is naglected?

Three capacitors 2,3 and 6 muF are connected in series to a 10 V source. The charge on 3muF capacitor is

What is the effective capacitance of two conductors of capacitance 3muF and 4muF , when connected in series

A 60 muF capacitor is connected to a 110 V, 60 Hz ac supply. Determine the rms value of the current in the circuit.

A capacitor of capacitance 6muF is charged to a potential equal to 150 V. Itspotential falls to 90 V, when another capacitor is connected to it. Find the capacitance of the second capacitor and the amount of energy lost due to the connection.

A 15muF capacitor is connected to a 220 V, 50 Hz source. Find the capacitive reactance and the current (r.m.s. and peak value ) in the circuit.