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Physics XII Notes for Physics Notes

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Ac Through Inductor Only

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Let an alternating emf be applied to a circuit containing inductor only such type of circuit is called inductive circuit.
Let the emf applied to the circuit is:
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Then the induced emf across the inductor is:

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This emf opposes the growth of current in the circuit. Applying kirchhoff’s voltage law in the loop of fig a,

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Integrating above expression we get,

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This is the form of alternating current developed in the purely inductive circuit. Equation i and ii shows that in a purely inductive circuit alternating emf leads the alternating current by π/2.

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