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Subatomic particles have the quantum mechanical property of spin. In the case of the magnetic field we can make the following point.

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Then you try to explain what happens to two charges moving in space both at the same speed and parallel to each other.

. Certain nuclei such as 1 H 2 H 3 He 23 Na or 31 P have a nonzero spin and therefore a magnetic momentIn the case of the so-called spin-1 2 nuclei such as 1 H there are two spin states sometimes referred to as up and downNuclei such as 12 C have no unpaired neutrons or protons and no net spin. In electromagnetism the magnetic moment is the magnetic strength and orientation of a magnet or other object that produces a magnetic fieldExamples of objects that have magnetic moments include loops of electric current such as electromagnets permanent magnets elementary particles such as electrons various molecules and many astronomical objects such as. Suppose that you finally succeeded in making up a picture of the magnetic field in terms of some kind of lines or of gear wheels running through space.

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