Ch 21, L2-AG, S'11

Ch 21, L2-AG, S'11 - CHAPTER 21 Coulombs Law Electric Field...

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Unformatted text preview: CHAPTER 21 Coulombs Law Electric Field Coulombs Law Charles Coulomb k = 8.99*10 9 N*m 2 /C 2 (in SI system) 4 1 !" = k , where is dielectric constant of vacuum = 8.85*10-12 C 2 /N*m 2 Fundamental electric constants What force acts between two point charges 1 C each separated by 10 cm ? ) C / Nm 10 9 ( 2 2 9 2 2 1 ! = = R q q k F (10-6 C )( 10-6 C) = (0.1 m) 2 = 0.9 N Coulomb Force q 1 q 2 + + F 1,2 F 2,1 ! F 1,2 = " ! F 2,1 q 1 q 2-- F 1,2 F 2,1 q 1 q 2- + F 1,2 F 2,1- Coulomb forces obey Newton s third law :- Coulomb force is a central force Opposite charges Like charges- Superposition of forces : total force acting on a charge is the vector sum of all individual forces acting on that charge Coulomb Force vs Gravitational Force How does the electrostatic force between two charges compare with the gravitational force between them, say +1C charge on masses of 1 kg and separated by 1km? Coulomb Force vs Gravitational Force Both are inverse square forces the 1 st depends on the product of the charges; the 2 nd on the product of the masses. The magnitude of the electrostatic force constant k in SI units is about 9x10 9 N*m 2 /C 2 , while the magnitude of G is about 6.67x10-11 N*m 2 /kg 2 ....
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This note was uploaded on 03/11/2011 for the course PHYSICS 212 taught by Professor Gruve during the Spring '11 term at UNL.

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Ch 21, L2-AG, S'11 - CHAPTER 21 Coulombs Law Electric Field...

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