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

Code Number:
Demo Title:
Faraday's Laws - Induced Currents
Currents and Forces by Induction
Area of Study:
Electricity & Magnetism
Lecture Table Galvanometer, Large and Small Coils, Horn and Bar Magnets, and Spring and Iron Masses.

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.


  • Roberto Rojas, "Sign and Sense of an Induced Electric Current by a Nearby Moving Magnet", TPT, Vol. 60, #2, Feb. 2022, p. 128.
  • Daniel T. M. Fontes, Andre Machado Rodrigues, "Faraday's Law Low-Cost Experiment Without Permanent Magnets", TPT, Vol. 59, #5, May 2021, p. 345.
  • Kader Médjahdi, "Faraday’s Law of Induction by Experiment", TPT, Vol. 57, #8, Nov. 2019, p. 560.
  • Yehuda Salu, "A Left-Hand Rule for Faraday's Law", TPT, Vol. 52, #1, Jan. 2014, p. 48. 
  • S. Eric Hill, "Rephrasing Faraday's Law", TPT, Vol. 48, #6, Sept. 2010, p. 410. 
  • Samuel Devons, "The Search for Electromagnetic Induction", TPT, Vol. 16, #9, Dec. 1978, p. 625.
  • Lloyd J. Davis, "AC Generator", TPT, Vol. 13, #5, May 1975, p. 311.
  • Nolan Samboy, "Modeling the Induced Voltage of a Disk Magnet in Free Fall", AJP, Vol. 91, #8, Aug. 2023, p. 617.
  • Xiao Xie, Zhu-ying Wang, Pingping Gu, Zhi-jian Jian, Xiao-lin Chen, and Zhong Xie, "Investigation of Magnetic Damping on an Air Track", AJP, Vol. 74, #11, Nov. 2006, p. 974.
  • Scott M. Cohen, "Active Learning in Lectures Introducing Magnetic Induction", AJP, Vol. 73, #3, Mar. 2005, p. 284.
  • Lowell T. Wood, Ray M. Rottmann, and Regina Barrera, "Faraday's Law, Lenz's Law, and Conservation of Energy", AJP, Vol. 72, #3, Mar. 2004, p. 376.
  • Robert Kingman, S. Clark Rowland, and Sabin Popescu, "An Experimental Observation of Faraday's Law of Induction", AJP, Vol. 70, #6, June 2002, p. 595.
  • Avinash Singh, Y. N. Mohapatra, and Satyendra Kumar, "Electromagnetic Induction and Damping: Quantitative Experiments Using a PC Interface", AJP, Vol. 70, #4, Apr. 2002, p. 424.
  • 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.
  • Daniel F. Dempsey, "The Rotational Analog for Faraday's Magnetic Induction Law: Experiments", AJP, Vol. 59, #11, Nov. 1991, p. 1008.
  • W. M. Saslow, "Electromechanical Implications of Faraday's Law: A Problem Collection", AJP, Vol. 55, #11, Nov. 1987, p. 986.
  • R. C. Nicklin, "Faraday's Law - Quantitative Experiments", AJP, Vol. 54, #5, May. 1986, p. 422. 
  • Richard Sankovich, "Faraday's Law Demonstration", AJP, Vol. 53, #1, Jan. 1985, p. 89. 
  • Art Huffman, "Special Relativity Demonstration", AJP, Vol. 48, #9, Sept. 1980, p. 780.
  • Robert B. Prigo, "A Magnetic Personality", AJP, Vol. 48, #8, Aug. 1980, p. 686.
  • Lanny Joe Reed, "Magnetic Induction and the Linear Air Track", AJP, Vol. 43, #6, June 1975, p. 555.
  • J. E. Fredrickson and L. Moreland, "Electromagnetic Induction: A Computer-Assisted Experiment", AJP, Vol. 40, #9, Sept. 1972, p. 1202.
  • H. W. Dosso and R. H. Vidal, "Magnetic Field Demonstrations", AJP, Vol. 31, #1, Jan. 1963, p. 59.
  • D. Amrani and P. Paradis, "Faraday's Law of Induction Gets Free-Falling Magnet Treatment", Physics Education, Vol. 40, #4, 2005, p. 313.
  • Andy Graham, "Faraday's Law in a Flash", PIRA Newsletter, Vol. 3, #7, Nov. 1988, p. 3.
  • "B-205. Magnet in Loose Coil",  DICK and RAE Physics Demo Notebook, 1993.
  • "B-207. Shaking Button Magnets in Cyl.", DICK and RAE Physics Demo Notebook, 1993.
  • G. D. Freier and F. J. Anderson, "Ek-2", A Demonstration Handbook for Physics.
  • David Kutliroff, "93. To Produce A Current, Energy Must Be Transferred", 101 Classroom Demonstrations and Experiment For Teaching Physics, p. 206.
  • David Kutliroff, "92. Introduction to Inductance", 101 Classroom Demonstrations and Experiment For Teaching Physics, p. 204.
  • Borislaw Bilash II and David Maiullo, "What Good Is A Newborn Baby?", A Demo a Day: A Year of Physics Demonstrations, p. 304.
  • Yaakov Kraftmakher, "1.12. Faraday's Law of Induction", Experiments and Demonstrations in Physics, ISBN 981-256-602-3, p. 43.
  • Raymond Bruman, "Generator Effect", Exploratorium Cookbook I, p. 81.1 - 81.2.
  • Robert Ehrlich, "N.2. Moving a Magnet Near a Coil with a Galvanometer", Turning the World Inside Out and 174 Other Simple Physics Demonstrations, p. 165.
  • Grant Mellor, "26. Electricity from Magnetism", Flying Tinsel, 1993, p. 113 - 116.
  • W. Bolton, "26. Electromagnetic Induction", Book 4 - Electricity, Physics Experiments and Projects, 1968, p. 52.
  • Rudolf F. Graf, "Magnetism Produces Electricity", Safe and Simple Electrical Experiments, p. 97.

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