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A light disc made of aluminium (a nonmagnetic material) is kept horizontally and is free to rotate about its axis as shown in the figure. A strong magnet is held vertically at
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ECOELER 6inch LED Flush Mount Disc Light, 10Pk 16.5W Dimmablel Ceiling Lighting Fixture, 4000K Cool White 1000Lm, Low Profile Aluminum Trim Surface Mount Downlight, Energy Star & ETL-Listed - Amazon.com
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