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The correct expression for the instantaneous current if instantaneous voltage is Vm(sint) in an inductive circuit is?

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The correct expression for the instantaneous current if instantaneous voltage is Vm(sint) in an inductive circuit is?

(a) i = Vm(sint)/XL

(b) i = Vm(cost)/XL

(c) i = -Vm(sint)/XL

(d) i = -Vm(cost)/XL
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Right answer is (d) i = -Vm(cost)/XL

Explanation: V=Vm*sint

I=V/XL = -Vm(cost)/XL  (since current lags voltage by 900 in inductive circuit).
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