These boatlets are propelled by magnetohydrodynamics (MHD). We used ten 0.34T neodymium magnets, two 9 V batteries, salt water at 10% salinity, two folded Aluminium foil electrodes and a 15 x 18 mm plastic channel. These vessels were built by two physics undergraduates for their First Year Project at Imperial College London in 2009.
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