^LC oscillator or tank circuit
^LC oscillator or tank circuit
When a charged capacitor is connected to a pure inductor & left for discharging, electromagnetic energy oscillates between capacitor & inductor in due to the sinusoidal variation of charge accordance with the relation 
with q = q0 cosωt & 
.
LC oscillator is equivalent to oscillations of a block connected to a spring on a smooth horizontal surface with following analogy
In actual practice the oscillations are damped as every inductor has some resistance.
