How does this scientist founded this electromagnet after further investigation?
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How does this scientist founded this electromagnet after further investigation?
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Danish scientist Hans Christian Oersted had discovered in 1820 that an electrical current in a wire from a battery caused a nearby compass needle to deflect. ... By 1831, he reported making an electromagnet that could lift 750 pounds, over thirty-five times its own weight (with coils in parallel, using a quantity battery).