Simple measure of the permeability of a material

How to measure the permeability of a material, comparing the current effect on a coil using a compass. When the magnetic needle is moved about 45 ° by an orthogonal magnetic force means that this applied force is about the same value of the Earth magnetic field. Measuring the ratio of the 2 currents to have 45 ° of deviation of the needle, when the same coil is powered without and with a core, it is possible to measure the the permeability of the core as ratio between the permeability of the core and the permeability of the air (that is about 1).

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