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======3D Magnetic Field Demonstration======


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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:** 
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====Summary====                   
{{$demo.summary}}


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/* PROCEDURE - Optional                                                                                */
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====Procedure====  
  - Add a few tablespoons of iron filings into a clear, sealable bottle.  
  - Fill the bottle with a viscous liquid (such as mineral oil, baby oil, corn syrup, or glycerin) until the filings are suspended and move freely.  
  - Seal the bottle tightly to prevent leaks.  
  - Hold the bottle up to a light source.  
  - Place a strong magnet against the side of the bottle and observe how the filings align along the magnetic field lines.  
  - Experiment with different magnet shapes (bar, horseshoe, etc.) and with multiple magnets to see how the patterns change.


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====Links==== 
3D Magnetic Field demonstration - Jade Nowlin: 
{{youtube>uHx8FF5a6jw?}}\\
Magnetic Field lines, 3D - Jon Jasinki (using commercially available apparatus): 
{{youtube>8llkHQtaOlg?}}\\
📄 3D Magnetic Field Viewer - botronics (Instructables): [[https://www.instructables.com/3D-Magnetic-Field-Viewer/]]\\


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====Variations====
  * Use different liquids (varying viscosity) to see how quickly the filings move into position.  
  * Try varying amounts of filings to observe differences in field visibility.  
  * Place two magnets in attraction and repulsion to compare the field interactions.  
  * Use colored light or backlighting to enhance the 3D visibility of the field lines.


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====Safety Precautions====
  * Handle neodymium magnets carefully—they can pinch fingers or shatter if allowed to snap together.  
  * Keep strong magnets away from electronics, credit cards, and pacemakers.  
  * Avoid inhaling or ingesting iron filings; wear gloves when handling them.  
  * Ensure the bottle is sealed tightly to prevent spills or leaks.


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====Questions to Consider====
  * Why do the iron filings align themselves in the presence of a magnetic field?  
  * How does the shape of the magnet affect the pattern of field lines?  
  * What happens when two magnets are placed near each other—both attracting and repelling?  
  * Why is a viscous liquid necessary instead of just air or water?  
  * How does this demonstration help visualize the otherwise invisible magnetic field?


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