Electroscope - FET

 

Code Number: 5A22.93

Demo Title: Electroscope - FET

Condition: Good

Principle: Electrostatic Deflection & Detection

Area of Study: Electricity & Magnetism

Equipment: 

FET Electroscope with 9 volt battery, positive and negative charging rods.

Procedure:

Plug a 9 volt battery into the battery clip of the FET electroscope.  Bring a negative charge near the sensing gate and the red LED will come on. A positive charge will make the green LED come on.

References:

  • Hina Morishige, Tetsuya Kato, "Triboelectric Series Using a Simple Charge Sign Checker", TPT, Vol. 60, #8, Nov. 2022, p. 667.
  • James Lincoln, "Devices that Can Identify Positive vs. Negative Charge", TPT, Vol. 55, #7, Oct. 2017, p. 440.
  • Xiang Yong Chen and Xing Wang, "Detecting the Polarity of an Electric Charge", TPT, Vol. 37, #6, Sept. 1999, p. 344.
  • "The Little Shop Physics: Static Sensor", TPT, Vol. 34, #8, Nov. 1996, p. 517.
  • William R. Gregg, "Three Inexpensive High - Voltage Electricity Demonstrations", TPT, Vol. 30, #7, Oct. 1992, p. 400.
  • Mihai P. Dinca, "Charge Sniffer for Electrostatics Demonstrations", AJP, Vol. 79, #2, Feb. 2011, p. 217.
  • Salvatore Ganci, "An Electroscope Discriminating the Sign of Charges", AJP, Vol. 62, #5, May 1994, p. 474.
  • Jodi and Roy McCullough, "Static Electricity", The Role of Toys in Teaching Physics, p. 4.48.
  • Gary Benoit, "A New Device for Studying Electric Fields", Apparatus for Teaching Physics, p. 151, Edited by Karl Mamola.
  • Robert D. Meyers, "An Easy-to-assemble Electroscope", The Science Teacher 28, 34, 1990.
  • Dick Heckathorn, "Modification to Electroscope",
  • Electroscope-5.jpg.
  • Jay Zimmerman, "Physics Demonstration Ideas".
  • William Beatty, "Inexpensive FET Electrometer", PIRA Newsletter,  Vol. 9, No. 3.
  • Tom Petruzzellis, "Electrostatic Fundamentals", Electronic Sensors for the Evil Genius, p. 195.
  • G. Jordan Maclay, "Electrical Engineering Experiment #2: Field Effect Transistors", Keithley Instruments Series II.
  • Forrest M. Mims III, "Electronic Electroscope", Science and Communication Circuits & Projects, p. 11.

Video Credit: Jonathan M. Sullivan-Wood.

5A22.93 - Electroscope - FET