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A mutual inductance bridge is described which employs operational amplifiers and a Kelvin–Varley divider in a configuration providing high precision and low noise. The linearity and stability of the bridge are approximately 10 ppm for the reactive part of the unknown mutual inductance in the frequency range 10–300 Hz. The noise is approximately 15 nV/√Hz. The bridge, built from readily available or constructed components, is suitable for cryogenic thermometry and ac susceptibility measurements.
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Michael R. Corson (1982) studied this question.
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