Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
1. The units of potential difference are A. B. C. D. J J/C V/m N/C © 2010 Pearson Education, Inc. Answer 1. The units of potential difference are A. B. C. D. J J/C V/m N/C © 2010 Pearson Education, Inc. 2. What are the units of the electric field? A. B. C. D. E. V/C N/C V/m J/C Ω/m © 2010 Pearson Education, Inc. Answer 2. What are the units of the electric field? A. B. C. D. E. V/C N/C V/m J/C Ω/m © 2010 Pearson Education, Inc. 3. The electric potential inside a parallel-plate capacitor A. is constant. B. increases linearly from the negative to the positive plate. C. decreases linearly from the negative to the positive plate. D. decreases inversely with distance from the negative plate. E. decreases inversely with the square of the distance from the negative plate. © 2010 Pearson Education, Inc. Answer 3. The electric potential inside a parallel-plate capacitor A. is constant. B. increases linearly from the negative to the positive plate. C. decreases linearly from the negative to the positive plate. D. decreases inversely with distance from the negative plate. E. decreases inversely with the square of the distance from the negative plate. © 2010 Pearson Education, Inc. 4. The electric field A. is always perpendicular to an equipotential surface. B. is always tangent to an equipotential surface. C. always bisects an equipotential surface. D. makes an angle to an equipotential surface that depends on the amount of charge. © 2010 Pearson Education, Inc. Answer 4. The electric field A. is always perpendicular to an equipotential surface. B. is always tangent to an equipotential surface. C. always bisects an equipotential surface. D. makes an angle to an equipotential surface that depends on the amount of charge. © 2010 Pearson Education, Inc. Example Problem Is the change in potential energy, ∆U, of a positive particle increasing, decreasing, or staying the same as it moves from points i to f? © 2010 Pearson Education, Inc. Conceptual Example Problem Rank in order, from largest to smallest, the electric potentials at the numbered points. © 2010 Pearson Education, Inc. Potential and Field for Three Important Cases © 2010 Pearson Education, Inc. The Capacitance of a Parallel-Plate Capacitor Q = C DVC © 2010 Pearson Education, Inc. What are capacitors good for? Store Energy That can be quickly released © 2010 Pearson Education, Inc. Energy stored in a Capacitor UC = QDVaverage What would Vaverage be? DVaverage is 0 + DV = ½ DV UC = ½ QDVC © 2010 Pearson Education, Inc. Q = C DVC Energy stored in a Capacitor UC = ½ QDVC Plug in Q = C DVC UC = ½ C(DVC)2 UC = ½ QDVC = ½ C(DVC)2 = ½ Q2/C © 2010 Pearson Education, Inc.