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Magnetic field Toroidal core help?

I'm just wondering what do the two different r's(R and r) represent? And why do we need two different radius's? toroid.jpg
Original post by ErniePicks
I'm just wondering what do the two different r's(R and r) represent? And why do we need two different radius's? toroid.jpg


The torus is like a straight sausage of circular cross section, wrapped end to end to form a larger object whose centre line is a larger circle. rr is the radius of the cross section of the sausage, RR is the radius of the circle through the centre line of the torus.
Reply 2
Original post by atsruser
The torus is like a straight sausage of circular cross section, wrapped end to end to form a larger object whose centre line is a larger circle. rr is the radius of the cross section of the sausage, RR is the radius of the circle through the centre line of the torus.

Thanks!

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