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PHY2049_05-18-11 - PHY 2049 Class Quiz PHY 2049 Physics II...

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5/18/2011 1 PHY 2049: Physics II square6 Coulomb’s law, electric field, Gauss’ theorem and electric potential. square6 -W = q Δ V square6 Energy conservation applies. F U E V qE F = x U F - = qV U = x V E - = PHY 2049: Class Quiz If 500 J of work are required to carry a charged particle between two points with a potential difference of 20V, the magnitude of the charge on the particle is: A. 0.040C B. 12.5C C. 20C D. cannot be computed unless the path is given E. none of these PHY 2049: Physics II What is the potential at the center point (in units of kq/d) ? a) -7 (b) -5 (c) -7 (d) -7 PHY 2049: Physics II Calculate the Electric Field at P Calculate the el. potential at P d kq V d kq E d kq E y x 4 2 2 3 2 2 2 1 1 5 2 2 2 - = = - = PHY 2049: Physics II ) ( 2 ln 2 2 2 2 z R z d d l l k r q k r q k V o i i i - + = + + = = = ε σ λ Point charge Distribution of charges Line charge at an edge Disc on an axis through the center Some old business: What is the electric field of a shell of a uniform spherical charge distribution?
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