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  4. 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?

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Q. 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?

Alternating Current

Solution:

$\varepsilon=\frac{MdI}{dt}$ or $\frac{\Delta \phi}{\Delta t}=\frac{M \Delta I}{\Delta t}$
$\Rightarrow \Delta \phi=M \Delta I=(1.5)(20-0)=30 \,Wb$