I am not quite getting how this works:(adsbygoogle = window.adsbygoogle || []).push({});

i have a serially connected two inductors L1 and La (primary) and a secondary circuit with also two inductors (L2 and Lb), the problem asks to find input impedance in s-domain.

The answer given is

s[La + L1 - M^{2}/(L2 + Lb)]

so, could someone explain how i am supposed to get negative term?

thanks in advance...

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# Homework Help: Zin(s) of magnetically coupled inductors

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