December 2014
Intermediate to advanced
418 pages
16h 17m
English
Content preview from Electricity and Magnetism
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Chapter 33
Gauss’s Law for Magnetism
In complete analogy with the computation of electric flux, one may compute the magnetic
flux through a surface S, i.e.,
Φ
m,S
=
Z
S
→
B · d
→
A .
→
B
d
→
A
FIGURE 33.1 Magnetic Flux Passing through Surface S
The SI unit of magnetic flux is the weber [ Wb ]. Recall, from Chapter 23, that another name
for the magnetic field,
→
B, is the density of magnetic flux, or magnetic flux intensity.
Thus, one weber per square-metre equals one tesla:
1 T = 1
Wb
m
2
.
The magnetic flux may be computed for [almost
1
] any surface. Our experience with electric
fluxes led us to consider the specialisation in which the surfaces were closed, and thence we
obtained ...
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