First slide

Capacitance

Question

The capacity of a condenser is 4 x 10^-6 farad and its potential is 100 volts. The energy released on discharging it fully will be

Easy

A

0.02 J
B

0.04 J
C

0.025 J
D

0.05 J

Solution

$U = \frac{1}{2} {CV}^{2} = \frac{1}{2} \times 4 \times 10^{- 6} \times {(100)}^{2} = 0 .02 J$

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