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2. Electric Potential and Capacitance
easy
A condenser of capacity $50\,\mu F$ is charged to $10\;volts$. Its energy is equal to
A
$2.5 \times {10^{ - 3}}\;joule$
B
$2.5 \times {10^{ - 4}}\;joule$
C
$5 \times {10^{ - 2}}\;joule$
D
$1.2 \times {10^{ - 8}}\;joule$
Solution
(a) $U = \frac{1}{2}C{V^2} = \frac{1}{2} \times 50 \times {10^{ – 6}} \times {(10)^2} = 2.5 \times {10^{ – 3}}J$
Standard 12
Physics
