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electric field 2

electric field 2 - Michael Faraday 1791-1867 Last Lecture...

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1 1 Michael Faraday 1791-1867 Lecture 4: The Electric Field II This lecture: HRW 22.6-22.7 For next time: HRW 23.1-23.5 Prof. Weiss’ Office hours for Friday 1/25 changed to 4-5 pm. 2 Last Lecture Electric field A set of vectors at every point in space Magnitude and direction at a point equal to the electric force per unit charge that would be experienced by a hypothetical electric charge at that point Electric field from point charges Electric dipoles: fields, torques and potential energy Electric field lines: powerful tool for visualizing electric field Today Continuous charge distribution; charge density Electric Field due to continuous charge distributions : Line of charge Arc of charge Charged disk 3 Q Continuous Charge Distribution Thus far, we have only dealt with discrete, point charges. Q line Q area How do we compute E, or F? Q volume Imagine instead that a charge Q is smeared out over a: 4 λ := Q/L σ := Q/A ρ: = Q/V Charge Density y Volume of charge -Charge per unit volume -Convention: ρ y Surface/sheet of charge -Charge per unit area

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electric field 2 - Michael Faraday 1791-1867 Last Lecture...

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