A non-magnetic copper plate falling near a magnet can be slowed to a halt in just inches because of something called eddy currents.
When a magnet moves near a conductor, circulating electrical currents (eddy currents) are created in the conductor. These currents create a magnetic field that opposes the field of the original magnet.
The stronger the magnet the greater the effect. A strong magnet dropped inside a non-magnetic conducting pipe like copper or aluminum will fall very slowly.
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Imagine It - Eddy current science
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