If you drop a magnet through a length (ell) of copper pipe, the time interval needed for

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If you drop a magnet through a length \(\ell\) of copper pipe, the time interval needed for the magnet to travel through the pipe (even if the magnet never touches the sides of the pipe) is much greater than the time interval the magnet takes to drop the same distance \(\ell\) in air. Why?

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