First slide

Capacitance

Question

A condenser of capacity 50 μF is charged to 10 volts. Its energy is equal to

Easy

A

2.5 X 10^-3 J
B

2.5 x 10^-4 J
C

5 X 10^-2 J
D

1.2 x 10^-8 J

Solution

$U = \frac{1}{2} {CV}^{2} = \frac{1}{2} \times 50 \times 10^{- 6} \times (10)^{2} = 2.5 \times 10^{- 3} J$

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