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Coulomb’s Law

Coulomb’s Law. Mid 18 th C.  question of the nature of the force acting between charges was a major scientific issue. Speculation was very Newtonian, relying on discoveries regarding gravity. Seemed to follow an inverse square law . 1785  Charles Augustin de Coulomb. Coulomb’s Law.

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Coulomb’s Law

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  1. Coulomb’s Law

  2. Mid 18th C.  question of the nature of the force acting between charges was a major scientific issue. • Speculation was very Newtonian, relying on discoveries regarding gravity. • Seemed to follow an inverse square law. • 1785  Charles Augustin de Coulomb

  3. Coulomb’s Law FE = k q1q2 r2

  4. FE– Electric Force • k- Coulomb’s law constant. In air, the value is 9 x 109 Nm2/ C2. • q1and q2– charges. Measured in Coulombs (C). • r- distance between the charges. • NOTE the similarities to the equation for Universal Gravitation.

  5. + force means repulsive, - means attractive

  6. Electric vs. Gravitational Force • A Hydrogen atom consists of an electron moving about a proton at an avg distance of 0.53 x 10-10 m. Find the electric and gravitational forces acting between the two particles.

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