Magnetic field
A magnetic field is a force which
is created by the movement of electric charges and magnetic dipoles which
exerts a force on moving charges and magnetic dipoles near to it. It is
represented by the magnetic field because it has a direction and magnitude at
every given point. The relative two fields denoted by B and H. In SI units B is
measured in teslas or newton per meter per ampere and H is measured in amperes
per meter.
The Magnetic Field (B)
The magnetic field (B) is defined
as a force which exerts on a moving charged particle. This observation is known
by performing experiments in electrostatics that a particle of charge q in an
electric field E experiences a force F=qE. According to lorentz force law.
Here q is the charged particle
moves in the particle of charge, E is the electric field, V is the velocity of
particle and B is the magnetic field.
The magnetic field (H)
According to the magnetic field (B),
there is a quantity H which is also called the magnetic field. In a vacuum B
and H are directly proportional to each other depending on the physical units. According
to the materials both H and B are different. The magnetic field H is used in
other terms and the magnetic field B is used for other terms which are as
follows:
The magnetic field (H) is used for
the following terms:
Magnetic field Intensity, Magnetic
field strength, magnetic field and magnetizing field.
The magnetic field (B) is used for
the following terms:
Magnetic flux density and magnetic
field.
SI Units
In SI units, B is measured
in teslas (symbol:
T) and ΦB is
measured in webers (Wb) so
that a flux density of 1 Wb/m2 is 1 tesla. The SI unit of tesla is
equivalent to (newton per second)/ (coulomb per metre). In Gaussian units, B is measured
in gauss (G). One
nanotesla is also called a gamma (γ). The H-field is measured in amperes per metre (A/m) in SI units.
Measurement
The following devices are used to
measure the magnetic fields:
Magneto meters, induction magneto
meters, rotating coil magneto meters, hall effect magnetometers, NMR
magnetometers, SQUID magnetometers and fluxgate magnetometers are used to
measure the local magnetic fields.
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