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An inductor resists a change in current through the creation/destruction of the magnetic field around the inductor. In an IR Circuit, when the electromotive force (the battery voltage) changes, the inductor will create a voltage to oppose the change, causing the current flowing through the circuit to change gradually over time rather than instantaneously. In an ideal IR circuit, the induced voltage is initially equal and opposite to the change in electromotive force, and it decays exponentially, with a time constant proportional to the inductance of the circuit.

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