An LC circuit 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 be $t=0$, At what time is the energy stored ? (i) Completely electrical? (ii) Completely magnetic ?

Question

$\begin{array}{1 1} Electrical : at \;t=0,\frac{T}{2},\frac{3T}{2},....\qquad Magnetic : at\; t=\frac{T}{4},\frac{3T}{4} ,\frac{5T}{4}...... \\ Electrical : at \;t=\frac{T}{4},\frac{3T}{4},\frac{5T}{4}....\qquad Magnetic : at\; t=0,\frac{T}{2},\frac{3T}{2} ...... \\Electrical : at \;t=T,3T,5T,....\qquad Magnetic : at\; t=0,\frac{T}{2},\frac{3T}{2} ,......\\ Electrical : at \;t=0,\frac{T}{2},\frac{3T}{2},....\qquad Magnetic : at \;t=T,3T,5T,...... \end{array}$