Quick Answer: The Eddy Current Kit gives a qualitative demonstration of Lenz's law using a 320 mm copper tube and two plugs of identical appearance and mass, one plain steel and one a neodymium magnet.
Last updated: October 2026
Key Features
Copper tube, 320 mm long and 15 mm in diameter
Pair of cylindrical plugs, identical in appearance and mass
One plug is plain steel; the other is a neodymium magnet
Pair of plastic caps for self-contained storage
Technical Specifications
Specification
Value
Tube material
Copper
Tube length
320 mm
Tube diameter
15 mm
Magnet type
Neodymium
Plugs
Pair: one plain steel, one neodymium magnet
About This Product
The two plugs look the same and have the same mass, but the time the magnet takes to fall through the copper tube is greatly extended. Eddy currents induced in the copper generate a magnetic field that opposes the movement of the magnet. Plastic caps close the tube so the kit stores as one unit. The Eddy Current Kit is available for supply within India and for export to Sri Lanka, Kazakhstan, Brunei, United Kingdom and Papua New Guinea.
Frequently Asked Questions
Q1. Why does the magnet take longer to fall through the tube? Eddy currents induced in the copper generate a magnetic field which opposes the movement of the magnet, greatly extending the time taken to fall.
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