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Re: [Phys-L] more about basic DC circuits



On 12/16/2013 10:40 AM, John Denker wrote:
On 12/16/2013 08:30 AM, Rauber, Joel wrote:
In Knight's defence, He defines the Law of Conservation of Current
as follows: " The current is the same at all points in a current
carrying wire." A very limited piece of applicability for a
conservation law.
Agreed. /snip/

Disagree. That sounds like a very poor kind of Law to me.

With the appropriate clarifications, it can be made more reasonable - put in this way.
A wire whose conductor has very much greater conductivity than its surrounding insulation will retain much the same current at its entrance and exit points. It is this ratio that is so strikingly different from the case for magnetic circuits, whose flux sees no such ratio as between the path and the surrounding medium.
But I am merely nit-picking, it's true.

Brian Whatcott Altus OK