The capacitance of a charged capacitor is C and the energy stored in it is U. What is the value of charge on the capacitor?

Explanation

To find the charge on a capacitor given its capacitance \( C \) and the energy stored \( U \), we can follow these steps:

### Step-by-Step Solution:

1. **Understand the relationship between energy, charge, and capacitance**:
The energy \( U \) stored in a capacitor can be expressed using the formula:
\[
U = \frac{Q^2}{2C}
...