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lecture9_electric_potential_and_capacitors_072111

lecture9_electric_potential_and_capacitors_072111 - Physics...

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Unformatted text preview: Physics 142 7/21/2011 A positive charge might be placed at one of three spots in a region where there is a uniform electric field. How do the electric potential, V, on the charge at positions 1, 2, and 3 compare? 0% 1. 0% 2. 0% 3. 0% 4. 0% 5. V is greatest at 1 V is greatest at 2 V is greatest at 3 V is 0 at all 3 spots V is = at all 3 spots but not = 0. Physics 142 Summer 2011 A proton is released from rest at point B, where the potential is 0 V. Afterward, the proton… 0% A. moves toward A with a steady speed. B. 0% B. moves toward A with an increasing 0% C. C. 0% D. 0% E. speed. moves toward C with a steady speed. moves toward C with an increasing speed. remains at rest at B. Physics 142 Summer 2011 Capacitor: Field and Voltage Parallel Parallel plate capacitor: Two identical conducting plates with equal and opposite charge density η rη ˆ E = i 0< x<d ε0 r E=0 x < 0 and x > d – Field strength inside approx. constant Physics 142 Summer 2011 Dr. Nick Cummings 1 Physics 142 7/21/2011 Two sheets of charge are separated by a distance d , small compared to the size of the sheets. The charge per unit area on the sheets are + η and -η. Select one graph below that could describe the electrostatic potential. 1. 2. 3. 4. 5. 6. 7. 8. 9. One Two Three Four Five Six Seven Eight Nine Physics 142 Summer 2011 Parallel Plate Capacitor: Visualizing voltage Voltage Voltage increases in a linear fashion as you move from the negative plate to the positive Physics 142 Summer 2011 Potential a Point Charge V= Q 4πε 0 r Potential for a point charge or charged sphere Physics 142 Summer 2011 Dr. Nick Cummings 2 Physics 142 7/21/2011 Physics 142 Summer 2011 A B C D E a) Which set of equipotential surfaces matches this electric field? b) c) d) e) 0% a) 0% b) 0% c) 0% 0% d) e) Physics 142 Summer 2011 Physics 142 Summer 2011 Dr. Nick Cummings 3 ...
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