By Lauren Altmeyer

Table of Contents Charles-Augustin de Coulomb Parents and Childhood EducationMilitary CareerResearch Coulombs Law DefinitionEquation Questions 123

Charles-Augustin de Coulomb Parents and Childhood Education Research Military Career Table of Contents

Parents and Childhood Born June 14, 1736 in Angouleme, France Parents were Henry Coulomb and Catherine Bajet Moved to Paris with his family shortly after birth Back Table of Contents

Schooling Attended the College Mazarin – Revieved the best available teaching in math, astronomy, botany, and mathematics In 1760, Coulomb began attending École du Génie at Mézières Graduated in November 1761 with a degree in engineering Back Table of Contents

Military Career Became an engineer in the Corps du Genie, the French army, in 1761 as a Lieutenant. Served for 20 hours in a variety of positions At the start of the French Revolution in 1789, Coulomb became highly involved in his scientific work In 1791, he retired from the Corps du Genie. Back Table of Contents

Coulombs Research In 1777, Coulomb created the Torsion Balance, a device used to measure electric charge. Used to measure the static forces between charges and established Coulombs Law Consists of a bar suspended in the middle by a thin fiber. When a charge is brought near the bar, the bar will twist. The magnitude of the force if proportional to the angle of the bar. Back Table of Contents

Coulombs Torsion Experiment Coulombs torsion balance was an insulating rod with a metal- coated ball attached to one end, suspended by a silk thread. The ball was charged with a known charge of static electricity, and a second charged ball of the same polarity was brought near it. The two charged balls repelled one another, twisting the fiber through a certain angle, which could be read from a scale on the instrument. By knowing how much force it took to twist the fiber through a given angle, Coulomb was able to calculate the force between the balls. Back

Coulombs Law Explanation Equation Table of Contents

k= 1/4πЄ 0 =9x10 9 Nm 2 /C 2 Є 0 = permittivity of Space Back

Coulombs Equation F= kq 1 q 2 /r 2k F=force k=Coulombs Constant q= charges of objects r= distance between objects Back Table of Contents

Coulombs Law Law that describes the attraction between two charged particles – Opposite charges will produce an attractive force while similar charges will produce a repulsive force. – The greater the charges, the greater the force – The greater the distance between them, the smaller the force. Back Table of Contents

Questions Table of Contents

Question 1 In what year was Coulomb born? A: 1680 B: 1492 C: 1736

Question 2 Which is the correct equation for Coulombs Law? A: B: C: F= kq 1 q 2 /r 2 F= kq 1 q 2 /r F= kq 1 q 2 r 2

Question 3 What is the name of the invention that Coulomb used to measure electric charge? A: Van de Graff Generator B: Torsion Balance C: Leiden Jar

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