I Electric resistivity and friction

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rude man

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The magnet exerts a torque on the sheet. I presume it's due to an interaction involving the electrons in the copper plate. It also works with an aluminum sheet, but it won't work with a wooden sheet.
Yes, that would be Eddy currents which are induced by the motion of the magnet and generate a magnetic moment to interact with the magnet. Eddy currents flow best in high-conductivity material and practically not at all in wood.
 

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