Relative position of two coils 1 and 2 is fixed. Coil 1 is carrying no current and when the current in coil 2 is increasing at a constant rate of 10 A/S, the emf induced in coil 1 is 20 mV. Find the magnetic flux linked with coil 2, which is not carrying any current, when coil 1 is carrying a current of 10 A.

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0.05 W

0.58 W

0.24 W

0.02 W

answer is D.

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Detailed Solution

If M be the coefficient of mutual inductance then ε12=−Mdl2dt⇒20×10−3=M×10⇒M=2×10−3H∴ ϕ21=Mi1=2×10−3×10 weber = 0.02 weber

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