grounding / choke

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GoldDigger said:
Before applying Lenz's Law to this situation you need to consider the geometry involved.
For a straight wire, Lenz predicts two things:
1. Circulating currents caused by the changing magnetic field which in turn create an electric field that opposed the original current. This is the mechanism behind the skin effect. This is a second order effect.
2. The magnetic field around the wire forming a fractional turn air core inductor which opposes any changes in current. This is a first order effect which is small for an air core of the size involved.
Add an aluminum raceway and you have an aluminum core inductor. Not much change.
Add a ferrous raceway and you have an iron core inductor. Big effect!.
Conclusion: their is an increase in impedance with aluminum, but nowhere near what you get with steel (except for non-magnetic alloys)
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Make sense. Thanks for that.
 
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