Electric Charges & Fields
Class 12 · Electric Charges & Fields

Faraday Cage Shielding

Toggle the cage on/off — see how a closed conductor shields its interior.

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Key Notes

01

A closed conducting shell shields its interior from external static fields.

02

Charges on the shell rearrange to cancel the external field inside.

03

The cage works for static fields exactly; for AC fields, mesh size and frequency matter.

Formulas

Cavity field

True regardless of external field, as long as no charge is in the cavity.

Important Points

Why your phone loses signal in a metal elevator.

Lightning protection inside cars: the metal body acts as a Faraday cage.

Faraday Cage Shielding notes from sciphylab (also known as SciPhy, SciPhy Lab, SciPhy Labs, Physics Lab). Class 12 physics revision for JEE Mains, JEE Advanced, NEET UG, AP Physics 1/2/C, SAT, and CUET-UG.