magnetic circuits question

Discussion in 'General Electronics Chat' started by Amanda_Riley, Oct 16, 2010.

1. Amanda_Riley Thread Starter New Member

May 12, 2010
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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?

2. t_n_k AAC Fanatic!

Mar 6, 2009
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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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3. Amanda_Riley Thread Starter New Member

May 12, 2010
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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.

4. t_n_k AAC Fanatic!

Mar 6, 2009
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Last edited: Oct 16, 2010
5. Amanda_Riley Thread Starter New Member

May 12, 2010
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or right. When I read it I pictured a square. Ive just started on the is module so not really sure about a few things.

6. t_n_k AAC Fanatic!

Mar 6, 2009
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Last edited: Oct 16, 2010