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AnswerWhen you connect DC voltage to an inductor, it opposes the passage of current, which generates a voltage pulse the is several times the value of the applied voltage.

When you disconnect the voltage, the electromagnetic field inside the inductor collapses and all the energy it stored is released to the circuit in the form of another large pulse, but this time with opposite polarity.

Remember:

Inductors oppose changes in current and they store energy in an electromagnetic field.

Capacitor oppose changes in voltage and they store energy in an electrostatic field.

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