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200 years ago Ørsted laid the foundation of electromagnetism in his famous experiment in which a magnetic needle is deflected in the electrical field of a platinum wire. For this he used his own Cu‐Zn trough battery, which was among the best then available, but 21 years later it was surpassed by the coal‐zinc battery invented by Bunsen, which became highly successful and acclaimed. That year, 1841,...
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