Butterfly Net

 

content.gif (1503 bytes)
 Code Number :   5B20.15

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.

Further information regarding legal liability in use of demonstrations and labs will be found on the web site Injuries in School/College Laboratories in USA.

The University of Iowa Disclaimers:  University of Iowa Disclaimer All Rights Reserved..

Condition :   Excellent  
Principle :   Corona Discharge, Surface Charge Density  
Area of Study :  Electricity and Magnetism   
Equipment :   Electrometer and sensing cage, two small paddles, butterfly net, charging rods, and clothes.

Procedure :   Charge the butterfly net with one of the charging rods.  With the small paddles show that the charge is on the outside of the butterfly net and not on the inside.  Using one of the strings connected to the inside of the net, turn the net inside out and show once again the charge is still on the outside.
conbot.gif (53 bytes)


   References

Thomas B. Greenslade, Jr., "Faraday's Bag (Photo)", AJP, Vol. 70, # 12, Dec. 2002, p. 1215. (Reprinted AJP, Vol. 72, # 1, Jan. 2004, p. 75.)

Ea-18, 19, 21:  Freier and Anderson,  A Demonstration Handbook for Physics.



Mail Questions and Comments to:  Dale Stille