A capacitor in an LC oscillator has a maximum potential difference of 15 V and a maximum energy of 360 $\mu$J.At a certain instant the energy in the capacitor is 40 $\mu$J.At that instant what is the emf induced in the inductor?
A)0 V
B)5 V
C)10 V
D)15 V
E)20 V

Question

Quizplus · Accepted Answer

The energy in the capacitor is given by $ \frac{1}{2}CV^2 $. At maximum energy, $ \frac{1}{2}CV^2 = 360 \mu J $ and $ V = 15 V $. At 40 $\mu J$, the potential difference is 10 V, so the emf induced in the inductor is also 10 V.

A Capacitor in an LC Oscillator Has a Maximum Potential μ\muμ

A Capacitor in an LC Oscillator Has a Maximum Potential $\mu$