Lec02-2 - Lecture 2-1 COULOMB FORCE q1q2 F = k 2 r1,2 1,2...

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Lecture 2-1 COULOMB FORCE 12 2 ˆ qq Fk r r = Charge q 1 “Test Charge” q 2 r 1,2 1,2 1,2 Question : How can q 1 sense q 2 without direct contact? NO! just as air around us, there’re some medium around a charge, the electric field that transfers the force. “Is action at a distance possible?”
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Lecture 2-2 READING QUIZ 1 HOW DOES THE MAGNITUDE OF THE ELECTRIC FIELD E FROM A POINT CHARGE Q DEPEND ON THE MAGNITUDE OF Q AND THE DISTANCE R TO THE FIELD POINT? A) E = k Q Q / R 2 A) E = k Q / R B) E = k Q / R 2 C) E = k Q Q / R A) E = k Q / R 3
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Lecture 2-3 Electric Field Define electric field , which is independent of the test charge, q 2 , and depends only on position in space: F E q =  2 0 1 ˆ 4 FQ Er qr πε = = Electric Field due to a Point Charge Q
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Lecture 2-4 Electric Field Lines • A visualization tool to illustrate the geometry of an electric field. • Electric field lines originate from positive charges and terminates at negative charges . • The direction of the electric field at any location is tangential to the field line there. • The magnitude of the electric field at any location is proportional to the density of the lines there. # lines/area ~ 1/r 2 ~ |E| (or at infinity)
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Lecture 2-5 Electric Field With this concept, we can “map” the electric field anywhere in space A Vector field 77 82 83 68 55 66 83 75 80 90 91 75 71 80 72 84 73 57 88 92 77 56 88 73 64
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Lecture 2-6 Demonstration Vandegraaff Generator
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Lecture 2-7 Electric field lines of two charges of equal magnitude dipole Far from the charges, electric
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Lec02-2 - Lecture 2-1 COULOMB FORCE q1q2 F = k 2 r1,2 1,2...

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