At 29:30min, Prof Lewin says that he gives a positive charge to the glass plate by rubbing it with cat fur, and then he touches it with a metal plate and then a metal conductor which somehow gets negatively charged. Can someone help explain how that happens?

http://ocw.mit.edu/courses/physics/8-02-electricity-and-magnetism-spring-2002/video-lectures/lecture-5-electrostatic-shielding-faraday-cage/

Question

At 29:30min, Prof Lewin says that he gives a positive charge to the glass plate by rubbing it with cat fur, and then he touches it with a metal plate and then a metal conductor which somehow gets negatively charged. Can someone help explain how that happens?

http://ocw.mit.edu/courses/physics/8-02-electricity-and-magnetism-spring-2002/video-lectures/lecture-5-electrostatic-shielding-faraday-cage/

anonymous · Answer

Just got the answer. http://en.wikipedia.org/wiki/Electrophorus