inductor
So initially S1 and S4 are closed and current flows as seen above.
After some time S1 and S4 are open and current flows as seen above. Now I am confused about the polarity of the inductor, what if I said the current flows through D1 and D4 instead of D3 and D2 ?, would that be wrong ?
You confuse the role of capacitor and inductor.
This is also easily understood: The energy stored in the inductor (supplied at times t<0) is at times t>0 continuously oscillating between the capacitor and the inductor at a frequency corresponding to the resonance frequency of the L-C circuit.
Inductors store energy in the magnetic field generated when current passes through them. When the supply is removed, the collapsing magnetic field induces a current flow in the same direction that it was traveling when it generated the magnetic field in the first place. This is why it is used as one of the storage devices in switching power supplies; the capacitor maintains the same voltage, and the inductor maintains the same current.
simulate this circuit – Schematic created using CircuitLab
(But don't try to actually build this circuit.)
Best Answer
Yes, you are wrong. The current enters the coil from the left while S1 and S4 are closed. If S1 and S4 are open, the coil will produce a voltage with the plus in its right so to mantain the current previous to the disconnection. That current will flow thru D2 and D3