Hans Christian Oersted’s Experiment
* Hans Christian Oersted performed an important experiment which showed that there was a connection between electricity and magnetism. * When a current was switched on through a wire, it made a compass needle turn so that it was at right angles to the wire. * The current had produced a magnetic field strong enough to cause the compass needle to turn. Additional effects due to experiment
* It was already known that an electric current in a wire has a heating effect, and may cause the wire to glow. This showed that the three phenomena of electricity, heat and light were connected. Experiment Apparatus
Andre Pierre Ampere’s Experiment
* Ampère showed that two parallel wires carrying electric currents magnetically attract each other if the currents are in the same direction and repel if the currents are in opposite directions. * This experiment led Ampère to formulate his famous law of electromagnetism, called after him Ampère's law, that describes mathematically the magnetic force between two electrical currents. * André-Marie Ampère (1775-1836), a French physicist, founded the science of electrodynamics now known as electromagnetism. * He was also first person to develop measuring techniques for electricity in order to perform his experiments. Ampère built an instrument utilizing a free moving magnetized needle (a compass) to measure the flow of electricity. Experiment Apparatus
Michael Faraday’s Experiment (the induction ring)
* When he passed an electric current through one coil he induced an electric current in the other coil, which flowed for a very brief period of time. * Making the induction ring was a tedious process since Faraday had to wind the coils of wire on opposite sides of the ring and insulate them with cotton. * main discoveries include those of electromagnetic induction, diamagnetism and...
Please join StudyMode to read the full document