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physics_6c_su08_exam_3

physics_6c_su08_exam_3 - PHYSICS 6C Summer 2008 EXAM#3...

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PHYSICS 6C Summer 2008 EXAM #3 Elementary Charge Electrostatic force on charge: e = 1.602 x 10 -19 C F = q E Coulomb’s Law: Electrostatic field of a point charge: F = kQq/r 2 E = (kQ/r 2 ) (k = 8.99 x 10 9 N-m 2 /C 2 ) Direction of E is away from positive charge Field near a plane of charge on a conductor: Electron Volt: E = σ / ε 0 1 eV = 1.602 x 10 -19 J σ = surface charge density ε 0 = 8.85 x 10 -12 F/m Superposition Principle: If E 1 , E 2 , E 3 are electrostatic fields at a point caused Gauss’s Law by charges q 1 , q 2 , q 3 , the total field at that point is: 0 / ε Q = ∫∫ dA E E = E 1 + E 2 + E 3 (Vector addition!) Electrostatic Potential Difference: Potential of a Point Charge: Δ V = = -(Electrostatic Work)/q V = kQ/r dl E Electrostatic Potential Energy: Capacitors: EPE = qV Q = CV Electrostatic energy = (1/2)CV 2 Superposition Principle (Potentials) Parallel plate capacitor: C = κε 0 A/d If V 1 , V 2 , V 3 are electrostatic potentials Magnitude of field in dielectric, E = E 0/ κ at a point caused by charges q 1 , q 2 , q 3 , (E 0 is magnitude of field in vacuum)
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