The magnetic field at the same time generates a current that fights the incoming current, making the incoming current needing to fight its way into the inductor. This is in essence because as you apply a voltage and a current starts to flow through the conducting element, a magnetic field is generated. It is a known law of physics that inductors will not tolerate abrupt changes in current either when they are being charged or when they discharge. Lets take a quick look at what is happening with our inductor. Whether it was a bipolar transistor or a FET, if a mechanism to overcome this generated current was not put in place, said transistor will not last long. If you did not take this fact of the laws of physics into account, chances are you have had the only once enjoyable experiencing of smoking your transistor. If you are driving inductive loads, whereas it is a brushed or brushless DC motor, stepper motor, solenoid or a relay, you must have experienced a little bit of a problem in the form of an unwanted current flowing in the unwanted direction.
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