By Lauren Altmeyer Table of Contents Charles-Augustin de Coulomb Parents and Childhood Education Military Career Research Coulomb’s Law Definition Equation Questions 1 2 3 Charles-Augustin de Coulomb Parents and Childhood Education Military Career Research 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 Coulomb’s 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 Coulomb’s 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 Coulomb’s Torsion Experiment • Coulomb’s torsion balance was an insulating rod with a metalcoated 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 Coulomb’s Law Explanation Equation Table of Contents k= 1/4πЄ0 9 2 2 =9x10 Nm /C Є0 = permittivity of Space Back Coulomb’s Equation F= 1 2 2 kq q /r F=force k=Coulomb’s Constant q= charges of objects r= distance between objects Back Table of Contents Coulomb’s 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 1 2 3 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 Coulomb’s Law? A: F= kq1q2/r2 B: F= kq1q2/r C: F= kq1q2r2 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 Correct!!! Next Sorry Try Again Next