magnetic permeability
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Magnetic permeability is a measurement of how easily a material allows a magnetic field to form and pass through it. Materials with high permeability are better at supporting magnetic fields, which is why they're useful in applications like electromagnets and transformers.
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Article
In electromagnetism, permeability is the measure of magnetization produced in a material in response to an applied magnetic field. Permeability is typically represented by the (italicized) Greek letter μ. It is the ratio of the magnetic induction
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