Polarity of coils on different legs of square core?

Thread Starter

electronice123

Joined Oct 10, 2008
339
If 2 coils (placed on a square coil and wound in the same direction) are on opposite legs and the coils are pulsed with a square wave will the polarity of each coil be the same?

See attachment, is it option 1 or option 2.
 

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PaulEE

Joined Dec 23, 2011
474
If 2 coils (placed on a square coil and wound in the same direction) are on opposite legs and the coils are pulsed with a square wave will the polarity of each coil be the same?

See attachment, is it option 1 or option 2.
I believe option #2 is correct. Here is my reasoning...

Along with your electrical circuit (the coils on either side of the core), there is also a magnetic circuit here - the core. When current is run through the first coil, "+" to "-", the magnetic flux generated in the core, according to the right-hand rule, flows downward during the positive pulse.

If you continue through the square loop, you'll end up going upward through the coil on the right-hand side of the core - which is the opposite case as compared with the other side. Because the magnetic flux is in the opposite direction, so is the current, and so would be the equivalent voltage.
 
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