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Basic Idea:

• Observe the behavior of charges during various experiments.

• 6

	What:	How Many:	Where:
	Small piece of foil on silk thread	1	non-Majors storeroom, shelf K3
	40 cm metal rod	1	non-Majors storeroom, shelf A3
	Pendulum clamp	1	non-Majors storeroom, shelf C2
	Large bench clamp	1	non-Majors storeroom, shelf C4
	Glass rod	1	non-Majors storeroom, shelf K3
	Hard rubber rod	1	non-Majors storeroom, shelf K3
	Charge transfer disk (metal disk on insulated handle)	1	non-Majors storeroom, shelf K3
	Electroscope	1	non-Majors storeroom, shelf K2
	Animal fur	1 chunk	non-Majors storeroom, shelf K3
	Brown paper towel (works better than silk!)	1	From dispenser in the lab
The following components are for the instructors' demo:
	Electrostatic generator	1	Lecture/demo room (Valentine 205A)
	Long metal rod	1	non-Majors storeroom, shelf B4
	Pendulum clamp	1	non-Majors storeroom, shelf C2
	Large rod base	1	non-Majors storeroom, shelf C4
	Hollow metal sphere on insulated rod	1	non-Majors storeroom, shelf K2
	Small coated styrofoam ball on string	1	Should be inside the hollow sphere!
	12" Wire	1	104 Lab
	'gator clip	2	Majors storeroom, shelf B2
The following item is shared:
	Oscilloscope (an old one)	1	Majors storeroom

Computers Needed?

• No.

• Lab setup (see this page for photo details):

  

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Note: Use a 12" wire (one that doesn't touch the lab bench), heavy gauge wire to connect the hollow sphere and the generator; this will prevent the sphere from discharging prematurely. The large bench clamp has been replaced with a large rod base.

• Make copies of "Charging an electroscope by induction" transparency (from Jones and Childers, Contemporary College Physics, figure 15.5. Located in Jeff's lab manual).
• Optional (at lab instructors whim): Set up DVD player, and show “Hollywood Physics” movie (3.5 minutes - Jeff has the disc)

©	St. Lawrence University	Department of Physics

Revised: 09 Jan 07

Canton, NY 13617