As I see the inductor, it is a devise that resists a change in current flow, and generates a magnetic field which opposes that change, if the voltage is applied for enough time for current to become stable, then is is just a piece of wire, remove the voltage, (open the switch) and the magnetic field collapses and generates a voltage of the same polarity with a higher amplitude in an attempt to keep the current at it's present state, theoretically, it could go high enough to arc across the switch if there is no other path for the current.
PS, back EMF is the magnetic field collapsing and opposes the applied voltage by being the same polarity, in motors, where the voltage is not switched, if the RW is 10 Ω and the voltage is 100V the motor would draw 10 amp, but the back EMF might be 90 volt at no load and current would be 1 amp, as you load the motor, the back EMF drops to 80 v and the current rises to 2 amps, more load, more current. In motors, back EMF is created by the rotating armature, slow the armature and it will draw more current, drive it faster and it becomes a generator via higher back EMF.
In SMPS, the collapsing magnetic field turns the inductor into a "generator"
IMHO