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Racing Magnets Through Different Pipes

See the effect of Eddy currents. A magnet is raced through four tubes made of: aluminium, plastic, copper, and copper with a slit in it. Which pipe will slow the magnet the most?

Sample examination question - 2006 HSC Examination

A student drops a bar magnet onto a large block of copper resting on the floor. The magnet falls towards the copper, slowing down as it comes close then landing gently. a) Explain the Physics responsible for this observation b) Predict what will happen if the experiment is repeated with a copper block cooled to approximately -50 degress celcius. Justify your prediction.

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