What happen when inductor has fully charged?

When an inductor is fully charged, it reaches a steady state where the current flowing through it is constant. At this point, the inductor behaves like a short circuit, and the voltage across it drops to zero, as it has stored maximum energy in the magnetic field. If the circuit is interrupted or switched off, the inductor will attempt to maintain the current flow, causing a voltage spike that can potentially damage components unless managed properly.