Please show formulas used and all work, thanks! 1. magnet falling thru Al tube,

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Please show formulas used and all work, thanks!

1. magnet falling thru Al tube, from the tube's perspective: The magnet fell with South end downward, at constant speed 1500mm/7.5s the magnetic field rose from 5mT at 30mm below the magnet to 250mT at the magnet bottom. the magnet diameter is 20mm ; the aluminum tube is 22mm inside diameter, and 3mm thick wall (so 28mm OD)
a) compute the negative change in the magnetic field just below the magnet (vector, with direction!), and the time taken to make that change.
b) use the magnet's Area to compute the Faraday source ??(B

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