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September 6, 2011 Physics for Scientists & Engineers 2, Chapter 21 1 Please register your iClicker at http://www.iclicker.com/support/ registeryourclicker/ Include the A when you enter your student ID!

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Electrostatic Force – Coulomb’s Law e law of electric charges is evidence of a force between any two charges at rest Experiments show that for the electrostatic force exerted by charge 2 ( q 2 ) on charge 1 ( q 1 ), the force on q 1 points toward q 2 if the charges have opposite signs and away from q 2 if the charges have like signs September 6, 2011 Physics for Scientists & Engineers 2, Chapter 21 2
Electrostatic Force – Coulomb’s Law Coulomb’s Law gives the magnitude of this force as k is Coulomb’s constant given by We can relate Coulomb’s constant to the electric permittivity of free space ε 0 September 6, 2011 Physics for Scientists & Engineers 2, Chapter 21 3 F = k q 1 q 2 r 2 q 1 and q 2 are electric charges r = r 1 r 2 is the distance between the charges k = 8.99 10 9 N m 2 C 2 k = 1 4 πε 0 , ε 0 = 8.85 10 12 C 2 N m 2

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September 6, 2011 Physics for Scientists & Engineers 2, Chapter 21 5 Force between Two Charges PROBLEM What is the magnitude of the force between two 1.00 C charges 1.00 m apart? SOLUTION is force is approximately the same as 450 loaded Space Shuttles! F = k q 1 q 2 r 2 F = 8.99 10 9 N m 2 C 2 1.00 C ( ) 2 1.00 m ( ) 2 F = 8.99 10 9 N