what is magnetic field
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A magnetic field is a force field that is created by moving electric charges (electric currents) and magnetic dipoles, and exerts a force on other nearby moving charges and magnetic dipoles. At any given point, it has a direction and a magnitude (or strength), so it is represented by a vector field. The term is used for two distinct but closely related fields denoted by the symbols B and H, where, in the International System of Units, H is measured in units of amperes per meter and B is measured in teslas or newtons per meter per ampere. In a vacuum, B and H are the same aside from units; but in a material with a magnetization (denoted by the symbol M), Bis solenoidal (having no divergence in its spatial dependence) while H is irrotational(curl-free).
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The region around the magnetic where its poles exhibit a force of attraction or repulsion is called a magnetic field. The magnetic field also induces when the electric charges are moving in space or an electrical conductor.
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