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Newnes Circuit Calculations Pocket Book
book

Newnes Circuit Calculations Pocket Book

by Thomas J. Davies
April 2016
Intermediate to advanced content levelIntermediate to advanced
384 pages
12h 56m
English
Newnes
Content preview from Newnes Circuit Calculations Pocket Book
Electromagnetism 167
10.7 Relative and absolute permeabilities
Using a magnetic core, such as steel inserted into a coil, increases
the flux produced by a given
m.m.f.
The ratio of the flux density in a
magnetic material to the flux density in a non-magnetic material
produced by the same magnetic field strength is called the relative
permeability, denoted by the symbol u.
r
. For a magnetic core,
therefore,
B
= ji
0
p.
r
//
The product |x
0
u.
r
is called the absolute permeability, u., and
B = ILH
B
Since u.
r
varies for different values of the magnetic field strength
(H),
it is convenient to represent the relationship between the flux
density (B) an ...
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Publisher Resources

ISBN: 9781483101132