First slide

Capacitance

Question

A condenser of capacity 50 $μ$ F is charged to 10 volts. Its energy is equal to

Easy

A

$2 \cdot 3 \times 10^{- 3} joule$
B

$1 .2 \times 10^{- 8} joule$
C

$5 \times 10^{- 3} joule$
D

$25 \times 10^{- 4} joule$

Solution

$\begin{array}{l} E = \frac{1}{2} {CV}^{2} = \frac{1}{2} \times (50 \times 10^{- 6}) \times (10)^{2} \\ = 25 \times 10^{- 4} joule \end{array}$

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