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Question:

why electric inside pure inductor is assumed to be zero?

if electric field is zero then how current passes through an inductor?

Answer:

the inductor is a coil of metal The E field inside is zero because it acts like a faraday shield. Within the metal if its a pure inductor there is no resistance. (copper losses zero) so a finite current is driven by a zero E field. (OK thats hard to comprehend, but only because a PURE lossless inductor is imposible)

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