First slide

Capacitance

Question

Calculate the amount of energy released on discharging a capacitor which has a potential difference of 200 V across its plates and 0.1 C charge is stored in it.

Moderate

A

5 J
B

10 J
C

20 J
D

2.5 J

Solution

Here, V = 200, q = 0.1 C.
Energy stored,
$U = \frac{1}{2} qV = \frac{1}{2} \times 0 .1 \times 200 = 10 J$
When the capacitor is discharged, it releases the same amount of energy i.e., 10 J.

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