Question:
A pair of adjacent coils has a mutual inductance of 1.5 H. If the current in one coil changes from 0 to 20 A in 0.5 s, what is the change of flux linkage with the other coil?
Answer:
Mutual inductance of a pair of coils, µ = 1.5 H
Initial current, 
= 0 A
Final current 
= 20 A
Change in current, 
Time taken for the change, t = 0.5 s
Induced emf, 
Where 
is the change in the flux linkages with the coil.
Emf is related with mutual inductance as:
Equating equations (1) and (2), we get
Hence, the change in the flux linkage is 30 Wb.
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