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Q.

A pair of adjacent coil has a mutual inductance of 1.5 H. If the current in one coil changes from 0 to 20 A in 0.5s , what is the change of flux linkage with the other coil?

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Detailed Solution

di=20−0=20A,dt=0.5s, M=1.5H
Induced emf in the circuit:
e=-Mdidt⇒dϕdt=Mdidt⇒dϕ=Mdi
The change of flux linkage: dϕ=Mdi=1.5×20=30 Wb

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