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Eddy Currents—Demonstration Kit

By: The Flinn Staff

Item #: AP4698 

Price: $36.49

In Stock.

With the Eddy Currents Electromagnetism Demonstration Kit, observe Lenz’s law in action. Dramatic, easy and unusual, this comes complete with instructions and detailed discussion.

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Product Details

Dramatic, easy—unusual! Drop a nonmagnetic cylinder down a two-foot-long metal tube and watch as it falls through the bottom in less than a second. Next, drop a similar-looking magnetic cylinder down the same tube. Your students will be amazed as they impatiently wait for several seconds before this cylinder finally emerges out the bottom of the tube. Students will discover that it’s not friction that slows the cylinder down—it’s Lenz’s law in action! As the magnetic cylinder falls through the metal tube, electrical (eddy) currents are produced in the tube. Eddy currents produce their own magnetic field that repels the magnetic field of the falling magnet, causing the magnet to slow down and fall at a constant speed. Comes complete with instructions and detailed discussion of eddy currents. Tube comes with end caps to make storage of the cylinders a snap.

Concepts: Eddy currents, Lenz’s law, magnetism.
Time Required: 10 minutes


Materials Included in Kit: 
Aluminum cylinder, wrapped in shrink tube
Aluminum tube, 2 feet long, 1" o.d., ⅛" w
End caps, vinyl, black, 1" x 1", 2
Magnet wrapped in shrink tube

Correlation to Next Generation Science Standards (NGSS)

Science & Engineering Practices

Asking questions and defining problems
Developing and using models
Planning and carrying out investigations
Constructing explanations and designing solutions

Disciplinary Core Ideas

MS-PS2.A: Forces and Motion
MS-PS2.B: Types of Interactions
HS-PS3.A: Definitions of Energy
HS-PS3.C: Relationship between Energy and Forces

Crosscutting Concepts

Cause and effect
Systems and system models
Energy and matter

Performance Expectations

MS-PS2-3: Ask questions about data to determine the factors that affect the strength of electric and magnetic forces
MS-PS2-5: Conduct an investigation and evaluate the experimental design to provide evidence that fields exist between objects exerting forces on each other even though the objects are not in contact
HS-PS2-2: Use mathematical representations to support the claim that the total momentum of a system of objects is conserved when there is no net force on the system.
HS-PS3-5: Develop and use a model of two objects interacting through electric or magnetic fields to illustrate the forces between objects and the changes in energy of the objects due to the interaction.