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Induction Coil, Faraday's Magnetic Field Induction Apparatus
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About Induction Coil, Faraday's Magnetic Field Induction
Michael Faraday discovered electromagnetic induction in 1831. He hypothesized that a changing magnetic field is necessary to induce a current in a nearby circuit. To test his hypothesis he made a coil by wrapping a paper cylinder with wire. He connected the coil to a galvanometer, and then moved a magnet back and forth inside the cylinder. To reproduce his experiment, attach a simple galvanometer (SS20502) to the coil using the 4mm binding post terminals. Next, attach the included magnet to the metal end of the included rod and inserting the magnet into the center of the coil. Moving the magnet back and forth, notice that the galvanometer needle moves, indicating that a current is induced in the coil. Notice also that the needle immediately returns to zero when the magnet is not moving. Faraday confirmed that a moving magnetic field is necessary in order for electromagnetic induction to occur.
