Thu, 2 Sep 1999 03:04:51 -0400

On Wed, 1 Sep 1999 19:56:58 -0700 (PDT) Eugene Leitl <> writes:

> writes:

>> But suppose you found a superconductive material that could carry 
>> a billion amps in a wire 1/4 inch thick.  Then the magnetic forces 
>> would tear the coil apart.


> It helps to make the coil large, very large. Like some ten miles in
> diameter.

I agree that the larger the area enclosed by the coil, the larger the storage capacity relative to the current and number of turns. I think the storage capacity of a superconductive coil is simply equal to the energy of the magnetic field created by the coil, which would be proportional to the product of the current, the area enclosed, and the number of turns; at least for a Helmholtz-style coil.

Ron Kean



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