Jeff has a master's in engineering and has taught Earth science both domestically and internationally.
Coulomb is most famous for his work with electricity and magnetism. His studies and papers were the first thorough accounts of how electricity worked and its relationship to magnetism.
In 1777, Coulomb understood that a needle on a pin creates friction and reduces accuracy. Coulomb replaced the fulcrum with a fine silk thread, and rather than the up-and-down motion of the pan balance, he used a twist or torsion around this thread. He was able to show that the amount of torsion is proportional to the amount of force.
Between 1785 and 1789, Coulomb studied the force of charges through precise experiments at the Royal Academy and published numerous papers on his findings. In 1785, Coulomb presented three papers on electricity and magnetism. These papers led Coulomb to the law that would eventually bear his name, Coulomb's law. Coulomb's law was the first dealing with a quantitative analysis of electricity.
Premier Mémoire sur l'Électricité et le Magnétisme
In his first paper, Coulomb describes the technique to construct his torsion balance, and the properties of the metal wires of having a reaction torsion force proportional to the torsion angle.' In this paper, Coulomb derived the law two bodies electrified of the same kind of electricity exert a repulsive force on each other.
Second Mémoire sur l'Électricité et le Magnétisme
In this publication, Coulomb describes the attractive force between two oppositely-charged objects. The force is proportional to the product of the quantities of charge on the objects and inversely proportional to the square of the distance between the objects.
Troisième Mémoire sur l'Électricité et le Magnétisme
In his second paper, Coulomb describes the loss of electricity that an isolated body loses over time.
Coulomb's law states that in a vacuum, the force between two stationary point charges is inversely proportional to the square of the distance. The power is proportional to the product of the force in the direction in which connected. Charges of the same sign repel, while opposite charge attract.
Mathematically written, Coulomb's law states:
F = k * (q1 * q2) / r ^ 2.
- F is the electrostatic force between the charges
- r is the distance between q1 and q2
- k is Coulomb's constant = 8.897 x 10^9 N m^2 C^-2
- q1 is charge 1
- q2 is charge 2
Coulomb is among the greatest physicists of the eighteenth century. His work with electricity and magnetism has shaped scientific thought since its publication. Coulomb's law described the force of electrical charge between two stationary charges in a vacuum. In honor of Coulomb's accomplishments, the Standard Unit of electric charge has been named after him, the Coulomb.
|The amount of torsion is proportional to the amount of force.|
|1st paper - two bodies electrified of the same kind of electricity exert a repulsive force on each other|
|2nd paper - describes the attractive force between two oppositely-charged objects|
|3rd paper - describes the loss of electricity that an isolated body loses over time|
|Coulomb's law - in a vacuum, the force between two stationary point charges is inversely proportional to the square of the distance|
After this lesson, be ready to:
- Describe Coulomb's discoveries involving electromagnetism
- Recall what he wrote in his three scientific papers on electricity and magnetism
- State Coulomb's law and recognize how it is mathematically expressed
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