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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.[nb 1] 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? A/m) in the SI. B is measured in teslas (symbol: T) and newtons per meter per ampere (symbol: N? 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. Extending these experiments, Amp? In it, he showed the equivalence of electrical currents to magnets and proposed that magnetism is due to perpetually flowing loops of current instead of the dipoles of magnetic charge in Poisson's model.[nb 3] This has the additional benefit of explaining why magnetic charge can not be isolated. Further, Amp? re derived both Amp? Amp? re's law, which, like the Biot–Savart law, correctly described the magnetic field generated by a steady current.

Also in this work, Amp? In 1. 83. 1, Michael Faraday discovered electromagnetic induction when he found that a changing magnetic field generates an encircling electric field.

He described this phenomenon in what is known as Faraday's law of induction. Later, Franz Ernst Neumann proved that, for a moving conductor in a magnetic field, induction is a consequence of Amp? In the process he introduced the magnetic vector potential, which was later shown to be equivalent to the underlying mechanism proposed by Faraday. In SI units, B is measured in teslas (symbol: T) and correspondingly ? B (magnetic flux) is measured in webers (symbol: Wb) so that a flux density of 1 Wb/m. The SI unit of tesla is equivalent to (newton·second)/(coulomb·metre).[nb 6] In Gaussian- cgs units, B is measured in gauss (symbol: G). The conversion is 1 T = 1.

G.) One nanotesla is also called a gamma (symbol: ?).[1. The H- field is measured in amperes per metre (A/m) in SI units, and in oersteds (Oe) in cgs units. Various phenomena have the effect of "displaying" magnetic field lines as though the field lines were physical phenomena. For example, iron filings placed in a magnetic field, form lines that correspond to 'field lines'.[nb 7] Magnetic field "lines" are also visually displayed in polar auroras, in which plasma particle dipole interactions create visible streaks of light that line up with the local direction of Earth's magnetic field. Field lines can be used as a qualitative tool to visualize magnetic forces. In ferromagnetic substances like iron and in plasmas, magnetic forces can be understood by imagining that the field lines exert a tension, (like a rubber band) along their length, and a pressure perpendicular to their length on neighboring field lines. Unlike' poles of magnets attract because they are linked by many field lines; 'like' poles repel because their field lines do not meet, but run parallel, pushing on each other.

The rigorous form of this concept is the electromagnetic stress–energy tensor. These magnetic dipoles produce a magnetic B- field. One important property of the B- field produced this way is that magnetic B- field lines neither start nor end (mathematically, B is a solenoidal vector field); a field line either extends to infinity or wraps around to form a closed curve.[nb 9] To date no exception to this rule has been found. See magnetic monopole below.) Magnetic field lines exit a magnet near its north pole and enter near its south pole, but inside the magnet B- field lines continue through the magnet from the south pole back to the north.[nb 1.

If a B- field line enters a magnet somewhere it has to leave somewhere else; it is not allowed to have an end point. Showtime Full Lock, Stock And Two Smoking Barrels Online Free there. Magnetic poles, therefore, always come in N and S pairs. Watch Turbo Kid Online Full Movie.