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I am struggling with using Kirchhoff\'s rule in circuits with Inductors. Looks l

ID: 1873915 • Letter: I

Question

I am struggling with using Kirchhoff's rule in circuits with Inductors. Looks like if you have an inductor, we have Electric field (E) that is created using a time varying magnetic field and that E is non conservative and hence you will have to use Faraday's and not Kirchoff's rule. I get that. But when you use Faraday's rule, Electric field within inductor is taken to be zero as it has zero resistance. I dont get the connection of zero resistance and zero electric field. why electric field in an inductor is zero?

Below is link where Prof Lewin uses Faraday's law. I get everything in this video other than why E should be zero within the inductor

https://www.youtube.com/watch?v=cZN0AyNR4Kw

Explanation / Answer

In DC Volatage supply, an Inductor at a steady state act as a plane wire. In an inductor there is no resistance, it carry inductance which depends upon frequency, thus AC Current source. with DC Supply at steady state it acts as a plane wire and will not show any resistance accoss it.

and hence electric field at steady state becomes zero.

as a short note you can remember, at steady state inductor acts as a wire and a capasitor act as an open circuit.

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