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magnet end and edge effects

labview1958
in Modern and Theoretical Physics

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Really need a context to know the meaning.

 

But maybe it has something to do with the edge of the magnet, well, that just sounds obvious, but like at the edge of a magnet the magnetic field is differently shaped as it has to curve around the magnet's corner or edge.

 

Maybe that is something to do with it... or maybe not!

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"In a conventional magnet with an air gap, there is a well-known end effect which may be described by saying that the effective length of the magnet is larger than the physical length by an amount which is roughly equal to the air gap."

 

I got this from a journal. How does a conventional magnet have an air gap?

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