Lenz's law is the universe's way of saying "balance must be kept," bhaiya. When the magnet falls, its motion creates currents in the pipe that push back against it, slowing the fall—this shows the kinetic energy changing into electrical energy, not disappearing. I saw this myself last week, using old copper wiring from a discarded motor and a magnet from a broken speaker; the magnet drifted down so slowly, like a leaf in still air. It's the same principle as when I run my sewing machine fast and the pedal gets warm—the energy has to go somewhere, it just changes its dhaan.
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