Assertion : In an AC circuit, current through an inductor always lag the source voltage by 9 0 ∘ . Reason : Voltage V induced across an inductor L and a time varying current i flowing through it bear

Question

Assertion : In an AC circuit, current through an inductor always lag the source voltage by 9 0 ∘ . Reason : Voltage V induced across an inductor L and a time varying current i flowing through it bear the following relation V = − L d t d i ​ .

TestHub · Accepted Answer

In a general AC circuit the current lags the source voltage by the phase angle $ϕ$ , not necessarily $9 0^{\circ}$ .

The $9 0^{\circ}$ lag holds only for a purely inductive circuit, so the assertion is false.

The induced emf across an inductor is given below.

$V = - L \frac{d i}{d t}$

So the reason is true.

Physics - EMI/AC Question with Solution | TestHub

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