Inductance Rebuttal
Dear Gary: Issue 45 of Widescreen Review contained a feature about Transparent Audio Cable. At one point Jack Sumner, principal of Transparent Audio Cable, was asked about the definition of inductance. Kimber Kable does not agree with Jack’s definition, so we have prepared a rebuttal. By way of introduction, Verne W. Hansen, MSEE, Associate Professor, Weber State University, part-time staff member of Kimber Kable. The following is a statement made by Jack Sumner in an interview with Gary Reber. During the interview, Gary Reber said, "Now, explain to the readers what inductance is." The answer from Jack Sumner was: "When alternating current passes through a wire in a magnetic field, and there is a magnetic field surrounding the earth, a current opposing the original AC is induced which behaves like out-of-phase resistance." This statement indicates a gross lack of understanding concerning the well-known principle of self-inductance, the principle to which the quoted statement refers. There is no requirement for a magnetic field from an external source. Furthermore, it is an opposing voltage that is induced that opposes the original alternating current. Magnetic (and electric) fields have a direction. If inductance were dependent on the earth’s magnetic field, then it would be necessary to align all inductors (north-south/ east-west) to get the inductance right. Specifically, Transparent’s cable and networks would be required to be aligned to a specific compass heading to maintain the tolerance claimed. The laws of physics governing self-inductance (which usually shortens to inductance) are Lenz’s law and Faraday’s law.
[There is more rebuttal, including the application of Lenz’s law and Faraday’s law, but it is both lengthy and technical. Access the complete rebuttal at www.widescreenreview.com.—Editor]
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