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⁻¹ or A/m) in the SI. B is measured in teslas (symbol:T) and newtons per meter per ampere (symbol: N·m⁻¹·A⁻¹ or N/(m·A)) in the SI. B is most commonly defined in terms of the Lorentz force it exerts on moving electric charges.

Magnetic fields can be produced by moving electric charges and the intrinsic magnetic moments of elementary particles associated with a fundamental quantum property, their spin. In special relativity, electric and magnetic fields are two interrelated aspects of a single object, called the electromagnetic tensor; the split of this tensor into electric and magnetic fields depends on the relative velocity of the observer and charge. In quantum physics, the electromagnetic field is quantized and electromagnetic interactions result from the exchange of photons.

Magnetic field (disambiguation)

A magnetic field is the physical phenomenon produced by moving electric charges and exhibited by ferrous materials.

Magnetic field or magnetic fields may also refer to:

Science

Other

The Magnetic Fields

The Magnetic Fields (named after the André Breton/Philippe Soupault novel Les Champs Magnétiques) is an American indie pop group founded and led by Stephin Merritt. He is the group's primary songwriter, producer and vocalist, as well as frequent multi-instrumentalist. The Magnetic Fields is essentially a vehicle for Merritt's songwriting, as are various side-projects, such as The 6ths, Future Bible Heroes and The Gothic Archies. While the musical style of the band is as malleable as Merritt's songwriting, its songs are commonly attributed to pop genres such as synthpop, indie pop, and noise pop. The band is often cited as being recognizable by Merritt's lyrics, often about love and often with irregular or neutral gender roles, that are by turns ironic, tongue-in-cheek, bitter, and humorous.

The band released their debut single "100,000 Fireflies" in 1991, which was typical of the band's earlier career characterized by synthesized instrumentation by Merritt with lead vocals provided by Susan Anway (and then by Stephin Merritt himself from The House of Tomorrow EP onwards). A more traditional band later materialized, currently composed of Merritt, Claudia Gonson, Sam Davol, and John Woo, with occasional guest vocals by Shirley Simms. Their best-known work is the 1999 three-volume concept album 69 Love Songs. It was followed in the succeeding years by a "no-synth" trilogy: i (2004), Distortion (2008), and Realism (2010). The band's most recent album, Love at the Bottom of the Sea, was released in 2012.