question_answer

LC circuit contains a 20 mH inductor and a \[50\,\mu F\]capacitor with an initial charge of 10 mC. The resistance of the circuit is negligible. Let the instant the circuit is closed at t=0. At what time is the energy stored completely magnetic?

A) t=0

B) t=1.57 ms

C) t=3.14 ms

D) t= 6.28 ms