Electronic – Would a faraday cage still work if it was part of a circuit

faraday-cage

Faraday cages protect against EM radiation and charges.

As far as I understand, this effect happens through the induction of an electric field, which produces a current inside of it, which then counteracts any incoming current. So, my question:

If I replaced part of a wire in my circuit with a faraday cage, say + at the feet and – at the top, would the interior still be protected, or would the current, given that the skin effect applies, move through both the outer surface and the inner surface? And are there any differences between DC/AC?

Best Answer

I replaced part of a wire in my circuit with a faraday cage, say + at the feet and - at the top, would the interior still be protected, or would the current, given that the skin effect applies, move through both the outer surface and the inner surface?

Assuming "part of Circuit" meant connected to a battery /generator then you cannot protect(from the electric field due to battery or generator) the material (metals) inside the Faraday's cage because an electric field would exist inside the Faraday's cage to satisfy Laplace's equation and boundary condition , although when connected to battery or generator material inside Faraday's cage still protected from electric field due to outside charges and we can prove it using Superposition theorem

And are there any differences between DC/AC?

In case of DC(battery) you'll get steady electric field inside the cage at steady state while in case of AC (generator) you'll get an alternating electric field at steady state .

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