Science Worksheet
Storyboard Text
- Charles Augustin Coulomb's father was Henry Coulomb and his mother was Catherine Bajet. Both his parents came from families which were well known in their fields.
- Coulomb became interested in measuring the electrical force between small charged objects and perfected a torsion balance which could reliably measure such small forces.
- TORSION BALANCE
- He suspended a needle on a fine fibre of silver, copper, or silk. The needle held a small electrically charged pith ball at one end and a counterweight at the other end, balanced so that the needle could rotate in a horizontal plane. The calibrated torsion balance measured the force needed to twist the needle through a given angle.By bringing a similarly charged pith ball near the one on the needle, Coulomb determined the repulsive force between the charged balls as a function of their separation. With these experiments, he launched the quantitative study of electric force.
- The force between two points charges was directly proportional to the product of the magnitude of two charges and inversely proportional to the square of the distance between them.
- We have arrived here by a method absolutely different from the first ... to conclude that the attraction of the electric fluid called ‘positive’ for the electric fluid, ordinarily called ‘negative,’ is as the inverse square of the distance.
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