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Transcript
A more “circuits” way of understanding the
dots is [1, pg. 215]
 If the two currents I1 and I2 are either
both entering or both leaving the dotted
terminals of the coils, then the signs of the
mutual terms are the same as the signs of
the self-terms.
 If one current is entering and the other is
leaving the dotted terminals, then the signs
of the mutual terms are opposite to the
signs of the self-terms.
One other essential idea is to remember that
a self-induced voltage across an inductor is
positive at the terminal into which the
current enters.
The voltages E1 and E2 result from the
composition of self-induced voltage and
mutual induced voltage in each coil. That is,
(a)
E1  L1 I1  MI 2
(b)
E2   L2 I 2  MI1
2