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I have been reading that an ideal supercondcutor can't have electric field inside it as its Resistance is zero. If you connect a superconductor with a voltage source will it not produce electric field inside .?

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I believe they do produce an electric field, because people design electromagnets with superconductors, and an electric field is necessary for an electromagnet.

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    $\begingroup$ An electric field is not necessary for an electromagnet. A current OR an electric field can induce a magnetic field, hence why Ampere's Law has two terms. $\endgroup$ – Billy Kalfus Feb 1 '18 at 2:43

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