In 1820, Hans Christian Oersted discovered that a magnetic needle is deflected by a current-carrying wire. For many years, he had expected to find a connection between electricity and magnetism. Before his discovery, Oersted had imagined the magnetic field to be a straight line along the direction of the wire - with the north pole at one end and the south pole at the other. This was a major reason why he took so long to discover electromagnetism. The figure below shows how Oersted would have arranged his wire and magnetic needle in his early experiments.

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CASE_STUDIESOersted's ExperimentMagnetic Field Due to Current-Carrying Straight Conductor2 sub-questions

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Magnetic Field Due to Current-Carrying Straight Conductor