07 Mar, 2013
PRESENTATION: A copper sheet may oscillate freely between the poles of an electromagnet while it is turned off. When the electromagnet is turned on the oscillatory movement suddenly stops. If the copper sheet is replaced by another one presenting several parallel cuts, it can be observed that the braking effect is weaker because the induced Foucault currents are also weaker. The magnetic field may be also created using permanent magnets.
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- Demonstrating Lenz’s Law with Recycled Materials, Carlos Saraiva, Phys. Teach. 44, 182 (2006)