Lenz Law and Eddy Current Demonstration

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Lenz’s Law - the direction of a current induced in an electrically conductive wire (e.g. copper wire) is such that the magnetic field the induced current creates opposes the change in magnetic field that generated the induced current to begin with. In simplified terms, the magnetic field from the induced current tries to prevent the changing magnetic field from changing.

A practical experiment for Lenz’s Law involves dropping a magnet down a copper pipe. We suggest using our EP656 D12mm x 3mmA magnets with 15mm diameter copper pipe and our EP372 D18mm x 3mmA magnets with 22mm diameter copper pipe. Lenz’s Law explains why the magnet falls slower than gravity down the copper pipe. The effect can be seen by placing the green magnetic viewing film around the outside of the copper pipe and then observing the field pattern on the copper pipe due to eddy currents as the magnet passes.

We offer both the magnets to fit 15mm and 22mm diameter copper pipe plus kits consisting of magnets plus copper pipe.

We also offer a Magnets in Motion kit (this is part of our Science Discovery Kit range). The Magnets in Motion Kit includes activity book containing 5 experiments and 5 projects.

Part No.	Size	Grade	Pull (kg)	Quantity	Price	Buy
EP656	12mm dia x 3mmA	N38 - NiCuNi plated	2.30	Pack of 10 Magnets	£6.00
EP372	18mm dia x 3mmA	N42 - NiCuNi plated	3.40	Pack of 10 Magnets	£11.00
Lenz-15	15mm dia x 500mm Copper Pipe c/w 1 pack of EP656 NdFeB 12mm dia x 3mmA	Copper Pipe and N42	N/A	Pack of 2 pipes and 1 x EP656	£11.00
Lenz-22	22mm dia x 500mm Copper Pipe c/w 1 pack of EP372 NdFeB 18mm dia x 3mmA	Copper Pipe and N42	N/A	Pack of 2 pipes and 1 x EP372	£18.00
731103	Magnets In Motion Kit	Science Discovery Kit	N/A	Pack of 1	£17.38
MVF50X50	50mm x 50mm	Green Viewing Film - Laminated in a clear pouch	N/A	Pack of 1	£3.49
MVF150X150	150mm x 150mm	Green Viewing Film - Plain material	N/A	Pack of 1	£22.50
MVF300X300	300mm x 300mm	Green Viewing Film - Plain material	N/A	Pack of 1	£72.00