Presentation Transcript

1. Coulomb’s Law

   By Lauren Altmeyer
2. Table of Contents Charles-Augustin de Coulomb Parents and Childhood Education Military Career Research Coulomb’s Law Definition Equation Questions 1 2 3
3. Charles-Augustin de Coulomb Parents and Childhood Education Military Career Research Table of Contents
4. 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
5. 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
6. 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
7. 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
8. Coulomb’s Torsion Experiment Coulomb’s 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
9. Coulomb’s Law Explanation Equation Table of Contents
10. k= 1/4πЄ0=9x109Nm2/C2 Є0 = permittivity of Space Back
11. Coulomb’s Equation F= kq1q2/r2 F=force k=Coulomb’s Constant q= charges of objects r= distance between objects Back Table of Contents
12. 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
13. Questions 1 2 3 Table of Contents
14. Question 1 In what year was Coulomb born? A: 1680 B: 1492 C: 1736
15. Question 2 Which is the correct equation for Coulomb’s Law? A: B: F= kq1q2/r2 C: F= kq1q2/r F= kq1q2r2
16. 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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