5K10.20 - Faraday's Laws - Induced Currents

Code Number:
5K10.20
Demo Title:
Faraday's Laws - Induced Currents
Condition:
Excellent
Principle:
Currents and Forces by Induction
Area of Study:
Electricity & Magnetism

Disclaimer

Equipment:
Lecture Table Galvanometer, Large and Small Coils, Horn and Bar Magnets, and Spring and Iron Masses.
Procedure:

Video Credit: Jonathan M. Sullivan-Wood

See 7F10.35.

Connect the galvanometer to one of the coils. Hold the coil still and move the magnet through the coil and observe the galvanometer deflection. Hold the magnet still and move the coil and again observe the deflection. Observe the effect when different poles of the magnet are used.

Simple Harmonic Motion or alternating current may be demonstrated by hanging some iron masses on a spring and sticking a magnet onto the bottom of the mass. Place the coil around the magnets when they are oscillating. The output of the coil can be shown on either the galvanometer or the oscilloscope.

 

References:
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  • José A. Manzanares, Juan Bisquert, Germa Garcia-Belmonte, Mercedes Fernandez-Alonso, "An Experiment on Magnetic Induction Pulses", AJP, Vol. 62, #8, Aug. 1994, p. 702.
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  • "B-205. Magnet in Loose Coil",  DICK and RAE Physics Demo Notebook, 1993.
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  • David Kutliroff, "93. To Produce A Current, Energy Must Be Transferred", 101 Classroom Demonstrations and Experiment For Teaching Physics, p. 206.
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  • Borislaw Bilash II and David Maiullo, "What Good Is A Newborn Baby?", A Demo a Day: A Year of Physics Demonstrations, p. 304.
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  • Grant Mellor, "26. Electricity from Magnetism", Flying Tinsel, 1993, p. 113 - 116.
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PDF icon University of Maryland Physics Department QOTW Question #226
PDF icon University of Maryland Physics Department QOTW Answer #226






Disclaimer: These demonstrations are provided only for illustrative use by persons affiliated with The University of Iowa and only under the direction of a trained instructor or physicist.  The University of Iowa is not responsible for demonstrations performed by those using their own equipment or who choose to use this reference material for their own purpose.  The demonstrations included here are within the public domain and can be found in materials contained in libraries, bookstores, and through electronic sources.  Performing all or any portion of any of these demonstrations, with or without revisions not depicted here entails inherent risks.  These risks include, without limitation, bodily injury (and possibly death), including risks to health that may be temporary or permanent and that may exacerbate a pre-existing medical condition; and property loss or damage.  Anyone performing any part of these demonstrations, even with revisions, knowingly and voluntarily assumes all risks associated with them.