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An LC circuit contains a 20 mH inductor and a 50 μF capacitor with an initial charge of 10 mC The resistance of the circuit is negligible.

Q7.12 An LC circuit contains a 20mH inductor and a 50\mu F capacitor with an initial charge of 10mC. The resistance of the circuit is negligible.
              (C) Let the instant the circuit is closed be t=0.

              (ii) completely magnetic (i.e., stored in the inductor)?

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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

t=\frac{T}{4},\frac{3T}{4},\frac{5T}{4}..

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

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