The energy stored in a coil with inductance L is determined as:

• A. \(L(\frac {dq}{dt})^2 \) J
• B. \(L{I^2}\) J
• C. \(\frac{1}{2L}{I^2}\) J
• D. \(\frac{1}{2}L(\frac {dq}{dt})^2 \) J