Abstract
It has been proposed that the magnetic susceptibilites measured with AC bridges at high frequencies ( f > 500 Hz) can be affected by high conductivities of samples. With model calculations ( f = 1000 Hz) we demonstrate for spherical samples (radius of 14 mm) that conductivity effects exceeding 0.1% are indeed expected in susceptibilities of high-conductivity samples (σ > 100 S m −1). However, the conductivity of most common rocks (σ < 0.01 S m −1) affects their susceptibility measurements by less than 0.00001%.
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