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Coulomb's Law

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Spacer The experimental purpose of this lab is to verify that the electric force between two charged bodies is inversely proportional to the square of the distance between them and directly proportional to the product of the charges on the two bodies.

Spacer The apparatus consists of two conducting balls one of which is suspended from a thread inside a cardboard box. A second ball is mounted on a plastic rod and can be inserted into the cardboard box from the side. Plastic strips and wool are available to charge the balls by induction. A small ruler is mounted on the inside rear of cardboard box to measure the deflection of the suspended ball when a similarly charged ball is brought near it.

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Student Handouts


Number of set-ups available: 1

Per lab station:

2 black wool cloths
2 white cotton cloths
2 clear plastic strips
2 white plastic strips
1 black box mounted on a wooden stand with pith ball suspended inside
2 sliding wooden blocks with pith ball mounted on end of plastic rod
1 plexiglass top piece for black box
1 fiberboard top piece for black box

Per class:

2 dehumidifiers (not shown in picture)



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