First slide

Capacitors and capacitance

Question

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

Easy

A

0.02 joule
B

0.04 joule
C

0.025 jolue
D

0.05 joule

Solution

$U = \frac{1}{2} C V^{2} = \frac{1}{2} \times 4 \times 10^{- 6} \times {(100)}^{2} = 0.02 J$

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