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The deﬁnition of resistivity (ρ = E/J) implies that an electric ﬁeld exists inside a conductor. Yet we saw in Unit 1 (i.e. Faraday Cage) that there can be no electric ﬁeld inside a conductor. Is there a contradiction here? Explain.

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The deﬁnition of resistivity (ρ = E/J) implies that an electric ﬁeld exists inside a conductor. Yet we saw in Unit 1 (i.e. Faraday Cage) that there can be no electric ﬁeld inside a conductor. Is there a contradiction here? Explain.