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Before begin with, suppose the capacitor is fully charged, with magnitude of charge q0 on each plate, with the help of the battery B AND key K. Now breaking the battery ckt, the charged capacitor is connected across the inductor through the other key K. The capacitor will begin to discharge through the coil. The flow of charge from C through L constitutes a current I. This changing current sets up a magnetic field around the coil L. Soon, a stage comes when C  is fully discharged and the field around L is saturated. The variations of magnetic field in the coil give rise to self induced emf which according to Lenz's law is with polarity opposite to that on the capacitor plates a little while ago.This back end recharges the neutral capacitor, plates acquire charge in opposite sense now. In the absence of resistance in this ckt., the energy of the electrical system remains constant and is exchanged between the MAGNETIC field energy stored in the coil and the ELECTRIC field energy stored between the plates of the capacitor.

Again, the process of discharging begins through the coil but the direction of current is reversed. A magnetic field is again set up around the coil, but with opposite polarity, till it reaches a saturation point and the capacitor is fully discharged The variations of magnetic flux again set up an induced emf in the coil. The induced current then recharges the capacitor to the saturation level of charge on its plates, and we regain the original starting stage.