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A balance for measuring magnetic susceptibilities at room temperature is described. Two small permanent magnets are supported by a suspension strip. The force that the sample exerts on one of the magnets is balanced by a current through a coil placed between the poles of the other magnet. The apparatus can be used in either the Gouy or the Faraday mode, and a force measurement takes approximately 15 s For diamagnetic liquids an accuracy of approximately 1% is attained (80 mu l required) while for 5-10mg of paramagnetic solid the accuracy is about 2%.
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D. F. Evans (1974) studied this question.
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