define magnetic field
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a magnetic field is a field around a magnet. if a metal is on the farther end of the magnetic field then the effect of attracting the magnet is weak but if it is close to magnetic the attraction is more strong.
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the magnetic field of a magnet can be seen by pouring iron filling besides the magnet till it forms a pattern
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Magnetic susceptibility is a dimensionless proportionality constant that indicates the degree of magnetization of a material in response to an applied magnetic field. ... A closely related parameter is the permeability, which expresses the total magnetization of material and volume
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