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J3-21. Faraday Cage
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J3-21. Faraday Cage
Purpose
To demonstrate that the electric field within a closed conducting surface is zero.
Equipment
Wire screen Faraday cage with pith balls and charging materials.
Images
Description
When the cage is charged, the aluminum foil "pith balls" move away from the outside of the cage, indicating the presence of an electric field. However, on the inside of the cage the pith balls do not move away from the wire cage, indicating that there is no charge and therefore no electric field on the inside of the conducting surface.◙
References
Zvi Geller and Esther Bagno, Does Electrostatic Shielding Work Both Ways?, TPT 32, 20-22 (1994).
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See pagesj1. electrostatic charge & force
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See pagesj3. electric fields & potential
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See pagesj4. capacitance & polarization
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See pagesj5. magnetostatics
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See pagesj6. electromagnets
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See pagesj7. magnetic materials
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See pagesj1. electrostatic charge & force
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See pagesj3. electric fields & potential
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See pagesj4. capacitance & polarization
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See pagesj5. magnetostatics
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See pagesj6. electromagnets
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See pagesj7. magnetic materials
Physics Lab Demos