lec02 - Coulombs Law of Electro-static Force Force exerted...

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1 Coulomb’s Law of Electro-static Force Force exerted by q 1 on q 2 at a distance r 12 F 12 = kq 1 q 2 r 1,2 2 ˆ r 1,2 Same sign charges: F 12 is in the direction of r 1,2 . Opposite sign charges: F 12 is in the direction opposite to r 1,2 . q 1 , q 2 in Coulombs (C) r 12 in meters (m) F 12 in Newtons (N) F 12 The Electric Field How does q 1 know of the presence of q 2 ? + + q 1 q 2 F r r q q k F ˆ 2 2 1 = Coulomb’s Law of Electro-static Force: q 1 sets up an electric field in the space surrounding it. At any point the field has both a magnitude and direction. A Scalar Field 77 82 83 68 55 66 83 75 80 90 91 75 71 80 72 84 73 82 88 92 77 88 88 73 64 These isolated temperatures sample the scalar field T, but T is defined (and can be measured) everywhere ( x , y ) 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 It may be more interesting to know which way the wind is blowing and how fast.

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2 The Electric Field The electric field is a vector field : consists of a distribution of vectors, one for each point in the region around a charged object. Test charge q o at point P + F Electric field at point P + E Define: Magnitude: Direction: Direction of that acts on a positive test charge F SI Unit: N/C Electric Field: Principle of Superposition
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This note was uploaded on 12/07/2011 for the course PHYS 241 taught by Professor Wei during the Fall '08 term at Purdue.

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lec02 - Coulombs Law of Electro-static Force Force exerted...

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