lec02_ddn

lec02_ddn - Lecture 2: The Electric Field Coulombs Law of...

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Lecture 2: The Electric Field * Summary from Last Class * Electric Field Coulomb’s Law of Electrostatic Force + + q 1 q 2 ! F r r q q k F ˆ 2 2 1 = ! Principle of Superposition: When several point charges are put together, the total force on any one charge is the vector sum of the each of the separate forces acting on that charge . Fun Fly Demo Principle of Superposition When several point charges are put together, the total force on any one charge is the vector sum of the each of the separate forces acting on that charge . F = F 21 y + F 31 y = 2 F 21 y F = 2 ! k Q 1 Q 2 r 2 cos30 0 F = 2 ! 9 ! 10 9 N " m 2 C 2 ! (10 # 6 C ) 2 ! 0.866 1 m ( ) 2 F = 15.59 ! 10 # 3 N F F 21 Exercise: Q 2 Determine force on Q 1 Q 1 =Q 2 =Q 3 =1 ! C Q 3 R=1m 60 0 Q 1 y x F 31 Problem Solving Strategies: Draw a clear FORCE diagram Use consistent units (meter, Coulomb, Newton) Remember that the force is a vector Look for symmetry
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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. The Electric Field The electric field is a vector field : 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
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lec02_ddn - Lecture 2: The Electric Field Coulombs Law of...

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