“magnetic field”的概念、定义、翻译、参考文献-科学参考

magnetic field

Physics

A field of force that exists around a magnetic body (see magnetism) or a current-carrying conductor. Within a magnetic field a magnetic dipole may experience a torque and a moving charge may experience a force. The strength and direction of the field can be given in terms of the magnetic flux density (or magnetic induction), symbol B; it can also be given in terms of the magnetic field strength (magnetizing force or magnetic intensity), symbol H.

The magnetic flux density is a vector quantity and is the magnetic flux per unit area of a magnetic field at right angles to the magnetic force. It can be defined in terms of the effects the field has, for example by B=F/qvsinθ‎, where F is the force a moving charge q would experience if it was travelling at a velocity v in a direction making an angle θ‎ with that of the field. The SI unit is the tesla.

The magnetic field strength is also a vector quantity and is related to B by:

$H = B / μ,$

where μ‎ is the permeability of the medium. The SI unit of field strength is the ampere per metre (A m⁻¹).

Mathematics

A vector field which exerts a force on moving electric charges. See Maxwell’s equations.

Space Exploration

The region around a permanent magnet, or around a conductor carrying an electric current, in which a force acts on a moving charge or on a magnet placed in the field. The force cannot be seen; only the effects it produces are visible. The field can be represented by lines of force parallel at each point to the direction of a small compass needle placed on them at that point. These invisible lines of force are called the magnetic field or the flux lines. A magnetic field's magnitude is given by the magnetic flux density (the number of flux lines per unit area), expressed in teslas.

Electronics and Electrical Engineering

The space surrounding a magnet or a current-carrying conductor and containing magnetic flux. It may be represented by lines of force whose direction at any point is the direction of the force exerted on a small coil (a search coil) placed in the field at that point. The direction of the force is normal to the magnetic flux density at that point. It is assumed that the dimensions of the coil are sufficiently small so as not to disturb the magnetic conditions.

Geology and Earth Sciences

See geomagnetic field.

单词	magnetic field
释义	magnetic field Physics A field of force that exists around a magnetic body (see magnetism) or a current-carrying conductor. Within a magnetic field a magnetic dipole may experience a torque and a moving charge may experience a force. The strength and direction of the field can be given in terms of the magnetic flux density (or magnetic induction), symbol B; it can also be given in terms of the magnetic field strength (magnetizing force or magnetic intensity), symbol H. The magnetic flux density is a vector quantity and is the magnetic flux per unit area of a magnetic field at right angles to the magnetic force. It can be defined in terms of the effects the field has, for example by B=F/qvsinθ‎, where F is the force a moving charge q would experience if it was travelling at a velocity v in a direction making an angle θ‎ with that of the field. The SI unit is the tesla. The magnetic field strength is also a vector quantity and is related to B by: $H = B / μ,$ where μ‎ is the permeability of the medium. The SI unit of field strength is the ampere per metre (A m⁻¹). Mathematics A vector field which exerts a force on moving electric charges. See Maxwell’s equations. Space Exploration The region around a permanent magnet, or around a conductor carrying an electric current, in which a force acts on a moving charge or on a magnet placed in the field. The force cannot be seen; only the effects it produces are visible. The field can be represented by lines of force parallel at each point to the direction of a small compass needle placed on them at that point. These invisible lines of force are called the magnetic field or the flux lines. A magnetic field's magnitude is given by the magnetic flux density (the number of flux lines per unit area), expressed in teslas. Electronics and Electrical Engineering The space surrounding a magnet or a current-carrying conductor and containing magnetic flux. It may be represented by lines of force whose direction at any point is the direction of the force exerted on a small coil (a search coil) placed in the field at that point. The direction of the force is normal to the magnetic flux density at that point. It is assumed that the dimensions of the coil are sufficiently small so as not to disturb the magnetic conditions. Geology and Earth Sciences See geomagnetic field.
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