A simple method for measuring the conductivity of metals is described. The conductivity is derived from the measurement of the voltage induced in a magnetic probe at the surface of a metallic specimen, subjected to an alternating magnetic field produced by a spiral magnet coil. This method will permit a rapid and accurate determination of the electrical conductivity of a metal sample, provided that the frequency of the current in the spiral coil is high enough to ensure that the skin depth is not more than one-fifth the thickness of the metal sample. The specimen being tested must also be at least 1.5 times larger than the outside diameter of the spiral coil to avoid edge effects.
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R. J. Rajotte (1975) studied this question.
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