The behavior of a coil with ferrite core applied with an ac current and under a magnetic field has been investigated. The field-induced changes of both inductance and impedance have been observed. Based on this, a device for electric current monitoring with the coil has been developed. The result has shown that such a device is very sensitive and high efficiency, and convenient to use in the field of power transmission and management.
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Rong et al. (2007) studied this question.
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