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Gigantic electromagnet at the nuclear research center in Geneva, Switzerland
Electromagnetism
The relationship between magnetism and electricity was first
discovered around 1820, using the very same experiment with wire and
compass that you tried on page 39. Scientists, who had previously
thought of these two things as being completely different, were highly
surprised. But there had already been a few clues before then. People
had often noticed that a compass needle could become reversed
after lightning struck a ship. Today we know that the lightning's
powerful magnetic field reversed its magnetization..
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