Lect_20_note

Lect_20_note - Chapter 31 1 Faradays Law Magnetism Oersted...

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Chapter 31 - 1 Faraday’s Law
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Magnetism Hans Christian Oersted doing his famous experiment Oersted : An electric current produces a magnetic field
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A Great Question E B ? ? ? E B Oersted/Ampere/Biot-Savart Many scientists
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Michael Faraday 1791 – 1867
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Faraday’s Experiment In 1831, he began his great series of experiments in which he discovered electromagnetic induction.
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Faraday’s Experiment – observations ± At the instant the switch is closed, the galvanometer (ammeter) needle deflects in one direction and then returns to zero ± When the switch is opened, the galvanometer needle deflects in the opposite direction and then returns to zero ± The galvanometer reads zero when there is a steady current or when there is no current in the primary circuit
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Faraday’s Experiment – observations ± An electric current can be induced in a circuit by a changing magnetic field ± The induced current exists only for a short time while the magnetic field is changing ± An induced electric field is produced in the secondary circuit by the changing magnetic field
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Lect_20_note - Chapter 31 1 Faradays Law Magnetism Oersted...

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