Magnetic field

Hans Christian Ørsted, Der Geist in der Natur, 1854

Compasses reveal the direction of the local magnetic field. As seen here, the magnetic field points towards a magnet's south pole and away from its north pole.

A magnetic field is the magnetic effect of electric currents and magnetic materials. The magnetic field at any given point is specified by both a direction and a magnitude (or strength); as such it is a vector field. The term is used for two distinct but closely related fields denoted by the symbols $B$ and $H$ , where $H$ is measured in units of amperes per meter (symbol: A·m or A/m) in the SI. $B$ is measured in teslas (symbol:T) and newtons per meter per ampere (symbol: N·m·A or N/(m·A)) in the SI. $B$ is most commonly defined in terms of the Lorentz force it exerts on moving electric charges.

单词	Magnetic field intensity
释义	Magnetic field intensity 英语百科 Magnetic field A magnetic field is the magnetic effect of electric currents and magnetic materials. The magnetic field at any given point is specified by both a direction and a magnitude (or strength); as such it is a vector field. The term is used for two distinct but closely related fields denoted by the symbols $B$ and $H$ , where $H$ is measured in units of amperes per meter (symbol: A·m or A/m) in the SI. $B$ is measured in teslas (symbol:T) and newtons per meter per ampere (symbol: N·m·A or N/(m·A)) in the SI. $B$ is most commonly defined in terms of the Lorentz force it exerts on moving electric charges.
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Magnetic field intensity

Magnetic field