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Question:

A magnetic circuit with an air gap question.?

A core of magnetic material is of constant cross-sectional area and has a short air gap. A magnetomotive force is applied, and it produces a flux in the series magnetic path but does not saturate the core. the flux density of the magnetic path a) is always the same in the air gap as in the iron.b) Will probably be somewhat greater in the air gap then in the iron.c) Will probably be somewhat less in the air gap.d) Will probably be much less in the air gap.

Answer:

a) is always the same in the air gap as in the iron.
a) but the flux DENSITY will be slightly less in the gap due to fringing.
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They do. It's a very complicated subject that involves the relationship of road surface, tire construction, friction, etc. There is a very good synopses at this web site: www.safetycenter.navy.mil/ashore/motorvehicle/downloads/CS2_Traction.pdf This is from Motorcycle Safety Foundation Experienced Rider Course material
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