Question

An LC circuit contains a 20 mH inductor, and a 50 μF capacitor, of the circuit is negligible. Let the instant, the circuit is closed, be t = 0. The (first instant of) time, at which energy stored would be completely magnetic, is

(1) t = 0

(2) t = 1.57 ms

(3) t = 3.14 ms

(4) t = 6.28 ms

Answer 1

(2) t = 1.57 ms

Total energy, in a LC circuit, is completely magnetic (at first) at t = T/4