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# About conductors i a conductor is always charged ii

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Unformatted text preview: I and III None are true Excess charge on a conductor in electrostatic equilibrium is uniform at the surface is NOT true in GENERAL. This is true in only special cases with lots of symmetry (planar, cylindrical and spherical). Physics 2B - Summer Session 2 - C. Palmer August 19, 2013 8   General   Form study groups   Do problems together   Make sure everyone in your group can do each type of problem   About physics content   You must be able to use Gauss’s Law.   It will be on the next exam.   Gauss’s Law and other topics related to electric flux (and magnetic flux) will certainly be on the final.   Draw pictures and force diagrams   Make flashcards for material properties Physics 2B - Summer Session 2 - C. Palmer August 19, 2013 9 Physics Concept Components Learning Outcome Electric Force and Fields Evaluate the forces of charged objects on one another. Evaluate value and magnitude of electric Charge and its analogy to fields at arbitrary points in space. mass Evaluate the potential differences between objects (surfaces and points). Coulomb’s Law and its analogy to gravity Calculate flux with surface integrals. Electric Fields Deduce electric fields using Gauss’s Law. Electric Flux Discern between electric potential and electric Gauss’s Law potential energy Electric Potential Compute electric field and potential for point Capacitance charges Material Properties Evaluate the potential differences between charged objects (surfaces and points). Compute electric field and potential from charge distributions Physics 2B - Summer Session 2 - C. Palmer August 19, 2013 10   Capacitance Q C= ΔV   Energy stored 2   Parallel Plates C|| Plate   Series Aε 0 = d 1 1 1 =+ + ... CEq C1 C2 1Q U= 2C   Parallel 1 1 2 = QΔV = C ( ΔV ) CEq = C1 + C2 + ... 2 2 Physics 2B - Summer Session 2 - C. Palmer August 19, 2013 11   Let’s start this time by assuming Gauss’s Law for ε 0 Φ E = ε 0 κ E ⋅ dA = QFree, Enclosed ∫ dielectrics   Electric Displacement D = ε 0κ E Physics 2B - Summer Session 2 - C. Palmer August 19, 2013 12 ε 0 Φ E = ε 0 κ E ⋅ dA = QFree, Enclosed ∫   There is INDUCED charged on the surface of the dielectric.   This charge does NOT contribute to the enclosed charge because of our usage of κ. Physics 2B - Summer Session 2 - C. Palmer –qIn +qIn + - August 19, 2013 - - - - - - - - - + + + + + + + + + 13 z x ε 0 Φ E = ε 0 κ E ⋅ dA = QFree, Enclosed ∫ y   What is the electric field inside of the parallel plate capacitor filled with dielectric, κ? Assume the electric field outside the capacitor is 0. Q − qIn B) Q A) E = ˆ ˆ E= y y ε 0κ A C) Q ˆ E= y ε0 A ε 0κ A...
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