In an ideal parallel L C circuit, the capacitor is charged by connecting it to a d.c. source which is then disconnected. The current in the circuit

Step-by-step solution

When the capacitor is connected to a d.c. source and then disconnected, it gets charged and then it starts discharging through the inductor. An induced emf is produced in the circuit which opposes the growth of current in L . When the capacitor is fully discharged, the electric energy stored in the capacitor (i.e. 1 / 2 q^ 2 / C ) gets converted fully into magnetic field energy (1 / 2 L I^2 ) . As soon as the discharge of the capacitor is complete, current stops and the magnetic flux linked with L starts collapsing