Question: What is the energy stored in a capacitor of capacitance 5 µF charged to 10 V?

Options:

1. 0.25 mJ
2. 0.5 mJ
3. 0.75 mJ
4. 1 mJ

Correct Answer: 0.5 mJ

Solution:

Energy (U) is given by U = 1/2 CV^2. Here, U = 1/2 * 5 µF * (10 V)^2 = 0.5 mJ.