A 5-µF capacitor is charged to 30 V and is then connected across a 10-µH inductor.The maximum value of the energy stored in the electric field of the capacitor is
A)0.750 mJ
B)22.5 mJ
C)34.7 mJ
D)45.0 mJ
E)54.4 mJ

Question

Quizplus · Accepted Answer

The maximum energy stored in the electric field of a capacitor is given by the formula $ \frac{1}{2} C V^2 $. For a 5-µF capacitor charged to 30 V, the energy is $ \frac{1}{2} \times 5 \times 10^{-6} \times (30)^2 = 22.5 $ mJ.

A 5-µF Capacitor Is Charged to 30 V and Is