Yes. It means that even if current is flowing there is no potential difference between one end and another of the superconductor. No voltage.
ΔV/(any I) = 0
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Anonymous2009-02-05 17:19
I am very confused. Why would current arise without voltage? If you place it in an electric field wouldn't that force there to be a voltage? At least until its electrons arranged properly so there wasn't any more?
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Anonymous2009-02-06 2:42
Ohm's law is based on a number of hypothesis that are only approximations. Superconductors probably have little chance of actually verifying those.
That's just it. There is no electric field! At least, not within a superconductor. There is no law stating that current absolutely requires an electric field to be present.
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Anonymous2009-02-10 18:10
>>9
| There is no electric field! At least, not within a superconductor.
WRONG,
in a semiconductor there is no resistance, there is still an electric field and surely there must be a current.
For a constant current there is no electric field within the conductor, all charge moves along the surface. This is why high strength superconducting magnets are made from many tiny wires for greater surface area.