When the current flowing through the coil changes, the time-varying magnetic field induces an electromotive force (emf) (voltage) in the conductor, described by Faraday's law of induction. According to Lenz's law, the induced voltage has a polarity (direction) which opposes the change in current that created it. As a result, inductors oppose any changes in current through them.
when the current flowing through the coil changes the time-varying magnetic field induces an electromotive force (emf) (voltage) in the conductor described by faraday's law of induction according to lenz's law the induced voltage has a polarity (direction) which opposes the change in current that created it as a result inductors oppose any changes in current through them