# Q7.12 An  circuit contains a  inductor and a  capacitor with an initial charge of . The resistance of the circuit is negligible.               (C) Let the instant the circuit is closed be .              (ii) completely magnetic (i.e., stored in the inductor)?

The stored energy will we purely magnetic when the pure electrical stored is zero. i.e. when the charge on the capacitor is zero, all energy will be stored in the inductor.

So, t for which charge on the capacitor is zero is

Hence at these times, the total energy will be purely magnetic.

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