======Electromagnetic Shielding with a Faraday Cage======


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**Materials: **{{$demo.materials_description}}\\
**Difficulty: **{{$demo.difficulty_description}}\\
**Safety: **{{$demo.safety_description}}\\
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**Categories:** {{$demo.categories}}
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**Alternative titles:** Faraday's Cage
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====Summary====                   
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====Procedure====  
  - Turn on the AM/FM radio and tune it to a station with a clear signal.  
  - Place the radio inside the Faraday cage.  
  - Close or secure the cage completely.  
  - Observe that the radio signal weakens or disappears.  
  - Remove the radio from the cage to show the signal returning.



====Links==== 
Electromagnetic Radiation Demo: Faraday Cage - Physics Demos: 
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📄 Faraday's Cage - Idaho State University: [[https://www.isu.edu/physics/outreach/physics-class-demos/electricity-and-magnetism/faradays-cage/]]\\
====Variations====
  * Try different devices such as a cell phone or walkie-talkie inside the cage.  
  * Use cages of different materials (e.g., wire mesh, metal box) to compare effectiveness.  
  * Test signal strength at different frequencies (AM vs FM).



====Safety Precautions====
  * Ensure the Faraday cage does not have sharp edges that could cause cuts.  
  * Handle electronic devices carefully to avoid damage.  
  * Do not connect the cage to a power source.




====Questions to Consider====
  * Why does the signal weaken or disappear when the radio is placed inside the cage? (The metal cage redistributes electric charges, blocking external electromagnetic fields from penetrating inside.)  
  * Why might AM signals be blocked more effectively than FM signals? (AM has longer wavelengths that may be more easily blocked by certain cage sizes and mesh spacing.)  
  * How is this principle applied in real-world technology? (Examples: shielding cables, microwave ovens, secure rooms against eavesdropping.)