Question: What is the potential difference across a capacitor of 2 microfarads charged to 10 volts?

Options:

1. 20 mC
2. 0.02 C
3. 0.02 mC
4. 0.2 C

Correct Answer: 20 mC

Solution:

The charge (Q) on a capacitor is given by Q = C * V. Here, Q = 2 x 10^-6 F * 10 V = 20 x 10^-6 C = 20 mC.