Electroscope -  FET



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 Code Number :   5A22.93

Disclaimer:

Reprinted by permission of Dick Berg, University of Maryland, for use on this website.

The demonstrations contained and referenced herein are listed for the purposes of cataloging and describing physics demonstrations which should be conducted only under the direction of a trained instructional support professional or physicist. These demonstrations are not presented for the purpose of being conducted by persons unconnected to this Facility and/or persons not consulting with or being supervised by the recognized instructional support professional or physicist and his/her staff. The University is responsible only for those demonstrations carried out using its own equipment using established safety and scheduling policies, and bears no responsibility for those choosing to use this source material for their own purposes. All demonstrations described and contained herein are public domain, and can also be found in reference materials in libraries, bookstores, and electronic sources.

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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.  
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   References                       

                                                                             

Xiang Yong Chen and Xing Wang,  "Detecting the Polarity of an Electric Charge,"  TPT, Vol. 37, # 6, p. 344, (Sept. 1999).

"The Little Shop Physics: Static Sensor,"  TPT, Vol. 34, # 8, p. 517, (Nov. 1996). 

William R. Gregg,  "Three Inexpensive High - Voltage,"  TPT, Vol. 30, # 7, p. 400, (Oct. 1992).

 

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.



Mail Questions and Comments to:  Dale Stille