magnetic circuits question

Thread Starter

Amanda_Riley

Joined May 12, 2010
22
I have a question. an electromagnet of square cross-section has an inner radii of 10cm and outer radii of 12cm

Can someone please tell me the definition of the inner and outer radii?
 

t_n_k

Joined Mar 6, 2009
5,455
Presumably this relates to a toroidal (doughnut like) shape - with a square rather than round cross section. Think of the hole in the doughnut as being defined by the inner radius and the outer extremity most distant from the center being defined by the outer radius.
 

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Thread Starter

Amanda_Riley

Joined May 12, 2010
22
Not sure if its a toroidial or what. heres the question below.

An electromagnet of square cross-section has a tightly wound coil with 1500 turns. The inner and the outer radii of the magnetic core are 10 cm and 12 cm, respectively. The length of the air gap is 1 cm. If the current in the coil is 4 A and the relative permeability of the magnetic material is 1200. Neglecting the effect of fringing.
 
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