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Chapter 22: The Electric Field

Read Chapter 22 Do Ch. 22 Questions 3, 5, 7, 9 Do Ch. 22 Problems 5, 19, 24 Chapter 22: The Electric FieldThe Electric Field Replaces action-at-a-distance Instead of Q1exerting a force directly on Q2at a distance, we say: Q1creates a Field and then the fieldexerts a force on Q2. NOTE: Since force is a vector then the Electric Field must be a vector Field !E EqF Does the Field really exist?It exists due to the finite speed of light (maximum speed of signal propagation) Electric charges inisolating shells1 Isolation removed(door open)234 Force is exerted after the source charge is isolatedInteraction by the Field rather than by chargeField E is defined as the force that would be felt by a unit positive test charge0/qFE SI units for the Electric Field : newtons per Field Lines Lines point in the same directionas the Field .

Gauss’s Law: The Equation ³ S E dA Q nc / H 0 & & •S is any closed surface. •Q enc is the net charge enclosed within S. •dA is an element of area on the surface of S. •dA is in the direction of the outward normal. 12 SI units 0 8.85 10 H u

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Transcription of Chapter 22: The Electric Field

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