I'm sure you are all familiar with calculating the inductance of a long transmission line.(adsbygoogle = window.adsbygoogle || []).push({});

We first calculate the partial self inductance and we add to the partial mutual inductance due to the current in the other conductors.

Looking at the image of a single-phase system, where I1 + I2 = 0.

The partial inductance per unit of length of wire 1 is given by this equation:

Here is my question:

Why do we estimate the MUTUAL flux linkage as the flux going through the GREEN area in the image and not the RED area?

I don't see how the flux outside both wires accounts for the mutual inductance of these two wires.

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# Help understanding Partial Mutual Inductance

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