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Wire Inductance vs. Frequency

August 30th Fact-of-the-Day

Wire inductance changes somewhat with frequency because of the way current distribution within a wire changes with frequency. Current distribution through the cross section of a wire is essentially uniform at very low frequencies. Current is concentrated more toward the surface as frequency increases toward infinity (skin effect). The high-frequency inductance of a wire is always less than the low-frequency inductance, because the redistribution of current at high frequencies always reduces magnetic flux linkages. However, wire inductance differences throughout the radio spectrum are not usually great. ©2004 Martek International All rights reserved.


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