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Unformatted text preview: 5/18/2011 1 PHY 2049: Physics II s Coulombs law, electric field, Gauss theorem and electric potential. s-W = q V s 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- + = + + = = = 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...
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