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One is joule heating from the induced current.
And cooling the ring in LN2 is an exciting way to show theOhm's Rule of Thumb that the lowered resistance results >in a greater
decreased resistance at lower T for most metals, as well as >illustrating
thru the coil, making the Lenz's Law explanation more >beleivable.
The demos of this that I have seen only send a single pulse of >current
(But then, I had been laboring under the misunderstanding that the >inertiaof objects, as measured by their mass, was responsible for >their Newton's