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Q.

A virtual current of 4A and 50 Hz flows in an ac circuit containing a coil. The power consumed in the coil is 240 W. If the virtual voltage across the coil is 100 V its inductance will be

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a

13πH

b

15πH

c

17πH

d

19πH

answer is B.

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Detailed Solution

R=Pimx2=24016=15ΩZ=Vi=1004=25ΩNow XL=Z2−R2=(25)2−(15)2=20Ω ∴2πV=20⇒L=202π×50=15πHz
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