27 July, 09:55
The definition of resistivity implies that an electric field exists inside a conductor. Yet we know that
there can be no electric field inside a conductor. Is there a contradiction here? Explain.
27 July, 10:41
There no electric field in a superconductor, since a superconductor has 0 resistance (and 0 resistivity).
Ordinary mere mortal conductors like silver and copper do have a little resistance and hence do have small electric fields inside. They are not perfect conductors.
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» The definition of resistivity implies that an electric field exists inside a conductor. Yet we know that there can be no electric field inside a conductor. Is there a contradiction here? Explain.