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Excerpt. In 1819 a danish physicist. H. C. Ostered was carrying out an ordinary class demostration. He passed an electric current trough a copper wire wich was joined to a voltaic cell. Amongst the apparatuses on his demostration bench there happened to be a magnetic needle and Oersted noticed that when his hand holding the wire moved near the needle the latter was deflected. With a quick jump of imagination he desconnected the ends of the wwire and connected them to the oposite ends of the Read More