The following terms find importance in magnetism. Explain them

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(a) Magnetic permeability is the ratio of magnetic induction to magnetising field strength. permeability, μ = \frac { B }{ H } (b) It is the field produced by the Amperian current. If n is the number of turns of a solenoid and I – the current through it, then H = nI. It is the magnetic field that magnetises the medium and is called magnetic intensity. (c) Intensity of magnetisation is defined as the magnetic moment per unit volume. I = \frac { M }{ V }, M – magnetic moment, V – volume (d) The ratio of intensity of magnetisation to the magnetising field strength is defined as magnetic susceptibility( χ ) χ = \frac { I }{ H }

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