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[return to "Ask HN: What scientific phenomenon do you wish someone would explain better?"]
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1. nightf+bJ
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2020-04-27 01:35:56
>>qqqqqu+(OP)
Eddy currents. Why does a magnet move slowly down a copper tube?
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2. OkayPh+Tu1
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2020-04-27 12:10:50
>>nightf+bJ
A changing magnetic field induces a current in a material, which creates an opposing magnetic field which slows the moving magnet.
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