Hello once again i am having a hard time understanding why the signs are the way they are, In the pictures bellow i have the solution to a problem where i am suposed to use the star equivalent to solve it . The first thing he does is to change the current I2 in order to be able to determine the values of the new Ls. But after that i dont understand why I2 is always positive when he is doing the mesh analysis in the equivalent circuit
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