Magnetic flux
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This article is about magnetic flux. For the magnetic fields "B" (magnetic flux
density) and "H", see Magnetic field.
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In physics, specifically electromagnetism, the magnetic flux through a surface
is the surface integral of the normal component of the magnetic field B over
that surface. It is usually denoted Φ or Φ . The SI unit of magnetic flux is
B
the weber (Wb; in derived units, volt–seconds), and the CGS unit is
the maxwell. Magnetic flux is usually measured with a fluxmeter, which
contains measuring coils and electronics, that evaluates the change
of voltage in the measuring coils to calculate the measurement of magnetic
flux.
Contents
1Description
2Magnetic flux through a closed surface
3Magnetic flux through an open surface
4Changing magnetic flux
5Comparison with electric flux
Description[edit]
The magnetic flux through a surface—when the magnetic field is variable—relies on splitting the surface into small surface elements,
over which the magnetic field can be considered to be locally constant. The total flux is then a formal summation of these surface
elements (see surface integration).
Jump to navigationJump to search
This article is about magnetic flux. For the magnetic fields "B" (magnetic flux
density) and "H", see Magnetic field.
Articles about
Electromagnetism
Electricity
Magnetism
History
Textbooks
show
Electrostatics
hide
Magnetostatics
Ampère's law
Biot–Savart law
Gauss's law for magnetism
Magnetic field
Magnetic flux
Magnetic dipole moment
Magnetic permeability
Magnetic scalar potential
Magnetization
Magnetomotive force
Magnetic vector potential
Right-hand rule
show
Electrodynamics
show
, Electrical network
show
Covariant formulation
show
Scientists
v
t
e
In physics, specifically electromagnetism, the magnetic flux through a surface
is the surface integral of the normal component of the magnetic field B over
that surface. It is usually denoted Φ or Φ . The SI unit of magnetic flux is
B
the weber (Wb; in derived units, volt–seconds), and the CGS unit is
the maxwell. Magnetic flux is usually measured with a fluxmeter, which
contains measuring coils and electronics, that evaluates the change
of voltage in the measuring coils to calculate the measurement of magnetic
flux.
Contents
1Description
2Magnetic flux through a closed surface
3Magnetic flux through an open surface
4Changing magnetic flux
5Comparison with electric flux
Description[edit]
The magnetic flux through a surface—when the magnetic field is variable—relies on splitting the surface into small surface elements,
over which the magnetic field can be considered to be locally constant. The total flux is then a formal summation of these surface
elements (see surface integration).
