This has the additional benefit of explaining why magnetic charge can not be isolated. 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. In quantum physics, the electromagnetic field is quantized and electromagnetic interactions result from the exchange of photons. ![]() 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. ![]() ![]() 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. B is most commonly defined in terms of the Lorentz force it exerts on moving electric charges. B is measured in teslas (symbol: T) and newtons per meter per ampere (symbol: N? A? 1 or N/(m? A)) in the SI. 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. 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. A magnetic field is the magnetic effect of electric currents and magnetic materials.
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