A delicate galvanometer placed inside a sealed metal box is unaffected by a strong external electric field. The phenomenon is called:
AElectrostatic shielding (Faraday cage)
BElectric polarization
CElectrostatic precipitation
DElectrostatic induction
Answer & Solution
Correct answer: A. Electrostatic shielding (Faraday cage)
Because the interior of a conductor is at constant potential and has zero field, an enclosure formed by conducting walls shields its inside from any external static field. This is the Faraday-cage effect.
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