Physics 012 1st Edition Lecture 5 Outline of Last Lecture I. Electric Field StrengthII. Electric Dipole: consists of two separated point charges that have the same magnitude but opposite signsIII. Conventions for Drawing Electric Field Linesa. Field lines are oriented radially outward from positive from positive charges and inward toward negative chargesb. Field lines do not crossc. Number of field line going to/coming from a charge reflect charge magnitude (more lines = greater magnitude)d. Direction of field at any point is tangent to field line at that pointe. Field is stronger where field lines are closer togetherProblem:These notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.Outline of Current Lecture IV. Electric Flux (Φ) = EAcosθV. Gauss’ Law: the electric flux through a closed surface is proportional to the net charge enclosed by the surfacea. Σ E cosθ ΔA = qenc/ε0b. ε0 = permittivity of free space = 1/4πk = 8.85 x 10-12 C2/(N*m2)c. E changes depending on where q is on the surface, but electric flux stays the samed. Charges outside of the surface will not change electric fluxe. σ = surface charge density = q/Af. ex) Spherical symmetryg. ex) Infinite plane of chargeh. ex) Parallel infinite planes of opposite chargei. ex) Infinite line of charge- λ = linear density =
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