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adapted to fit the new model of a long magnet made by an array of magnetic dipoles instead of the original model of a single magnet dipole.

Long Magnet falling through a ring
When a long magnet falls through a ring, current is induced in the ring. This phenomenon is called electromagnetic induction.

According to Faraday’s law, the induced emf is proportional to the negative of the rate of change of magnetic flux Φ. The direction of the induced current is determined by Lenz’s law, the induced current produces magnetic field which tends to oppose the change in magnetic flux that induces such currents.

The voltage induced when a magnet is falling through a ring is simulated in this experiment, where we model the magnet as a vertical set of magnetic 'dipoles'. The current is visualized by very big 'electrons' that move according to the strength of the current.

Please, complete this set of Minds-On questions:
Explain the shape (positive and negative peaks) of the recorded signal.
Why the peaks are not symmetric?
At which moment was the magnetic flux changing most quickly?
What was the total change of magnetic flux during the first half of the magnet’s fall - while it was moving in to the coil?
What was the total change of magnetic flux during the second half of the magnet’s fall - while it was moving out of the coil?
How could you change the simulation to increase the magnitude of the sign?
The original simulation was created as part of the MOSEM2 project.


For Teachers

falling magnet through coil simulation.
falling magnet through coil simulation.
author:  paco, 
lookang,and engrg1

made changes:
can track up to 5 different color-runs now
right panel 600 width bigger as suggested by zhiye on another collision sim

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Software Requirements



  1. ejs_model_FallingMagnet13_4.3.0AJCEMI-applet_worksheet - stud_copy final.pdf
  2. ejs_model_FallingMagnet13_4.3.0AJCElectromagnetic_Induction_Post_Test_soln.pdf
  3. ejs_model_FallingMagnet13_4.3.0RVHS2013EduLabs (EMI - Falling Magnet).docx
  4. ejs_model_FallingMagnet13_4.3.0RVHS2013Falling Magnet Pre-Activity Worksheet.docx
  5. ejs_model_FallingMagnet13_4.3.0RVHS2013P06 EduLabs (EMI - Falling Magnet) (tr).docx
  6. ejs_model_FallingMagnet13_4.3.0RVHSEdulab EMI worksheet 23 Mar 2012.doc
  7. ejs_model_FallingMagnet13_4.3.0RVHSEdulab EMI worksheet 23 Mar 2012.pdf
  8. ejs_model_FallingMagnet13_4.3.0RVHSFalling Magnet Pre-Activity Worksheet (1).docx
  9. ejs_model_FallingMagnet13_4.3.0RVHSFalling Magnet Pre-Activity Worksheet.docx
  10. ejs_model_FallingMagnet13_4.3.0RVHSP06 EduLabs (EMI - Falling Magnet) (tr).docx
  11. ejs_model_FallingMagnet13_4.3.0SRJC2013Electromagnetic Induction ICT Worksheet (students)lookang.docx
  12. ejs_model_FallingMagnet13_4.3.0SRJC2013Pre and Post Test EMI lookang.docx
  13. ejs_model_FallingMagnet13_4.3.0SRJCElectromagnetic Induction ICT Worksheet (Ans).docx
  14. ejs_model_FallingMagnet13_4.3.0SRJCElectromagnetic Induction ICT Worksheet (students).docx


  1. Ejs Open Source Long Magnet Falling Through Solenoid Model with AJC BlogPost
  2. bar magnet oscillating inside a solenoid java applet BlogPost

  3. RVHS research design for scaling up Magnet and Solenoid Model

  4. Ejs Open Source Magnet Falling Through Ring Model Java Applet

  5. falling magnet through coil simulation SRJC 
  6. Magnet Falling Through Ring Model written by Maria Jose Cano, Ernesto Martin & Francisco Esquembre.


Other Resources

  1. by – ukukuku 


Maria Jose Cano, Ernesto Martin & Francisco Esquembre, lookang, sze yee.

MOSEM2 project.

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