Lecture Demonstrations Laboratory

The Demonstrations Manual

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Electrostatics: Kinds of Charge and Charging; Attraction and Repulsion Between Charged Objects; Charging by Induction; Lord Kelvin's water-drop electrostatic generator; Xerox
Electric Fields And Potential
Capacitance
Current and Resistance
Electromotive Force And Current
DC Circuits
Magnetic Materials
Magnetism
Inductance
Induction
Complex Circuits
Semiconductors And Tubes
Transmission Lines and Antennas

Attraction and Repulsion Between Charged Objects

Purpose:

To demonstrate some properties of charged objects.

Procedure:

Charge the pith balls with either the teflon or acrylic rod and show attraction and repulsion. Balance 2"x4" on watch glass to provide low friction pivot. Charge rod with fur and hold close to the 2x4 with the rod parallel to the long axis of the 2x4, which will then rotate on the watch glass.

Comments:

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Equipment:

2"x4" about two meters long
Hanging pith balls
Watch Glass
Charging Rods and Silk