# Coil Winding Sense of Inductor/Transformers and Output Polarity

Given a solenoidal coil, if it is wound in one sense (say clockwise), would the output from it, in terms of polarity, be equivalent to another coil, wound in the opposite sense (counter-clockwise), with its lead also swapped? In other words, does switching the leads from an inductive coil produce the same effect as changing the winding direction of the the coil?

For an inductor, this primary instance where this would come into play is if the coil were used as an antenna of an inductive RF signal; would the polarity of the RF signal and the polarity of the voltage coming from it match or not in accordance with the right hand rule?

For a transformer, this is slightly more complex, because now it is the relative winding sense of one coil with respect to the other, the primary to the secondary. For instance, if both coils were wound clockwise or counterclockwise, would the polarity from one coil to the next would correlate in one way, but if one coil was wound clockwise and the other counter-clockwise, would the polarities correlate in the opposite way?

Here is a diagram to illustrate this question: A mathematical (or at least graphical) proof of this would be helpful.

• Changing winding direction in DC coils, reverse the S and N pole of the coil. – GR Tech Nov 23 '14 at 23:21