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# hw3sols - MasteringPhysics 1:47 PM Assignment Display Mode...

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2/27/08 1:47 PM MasteringPhysics Page 1 of 12 http://session.masteringphysics.com/myct Assignment Display Mode: View Printable Answers Physics 202 Assignment 3 Due at 11:00pm on Wednesday, February 13, 2008 View Grading Details Electric Fields and Equipotential Surfaces Description: Find the work done to move a unit charge from and to given points on a diagram showing equipotential surfaces, and compare the magnitude of the electric field at these points. The dashed lines in the diagram represent cross sections of equipotential surfaces drawn in 1- increments. Part A What is the work done by the electric force to move a 1- charge from A to B? Part A.1 Find the potential difference between A and B What is the potential difference between point A and point B? Hint A.1.a Equipotential surfaces Recall that an equipotential surface is a surface on which the electric potential is the same at every point. Express your answer in volts. ANSWER: = Hint A.2 Potential difference and work Recall that the potential difference (in volts) between a point and a point equals the work (in joules) done by the electric force to move a 1- charge from to . Express your answer in joules. ANSWER: = [ Print ]

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2/27/08 1:47 PM MasteringPhysics Page 2 of 12 http://session.masteringphysics.com/myct Part B What is the work done by the electric force to move a 1- charge from A to D? Part B.1 Find the potential difference between A and D What is the potential difference between point A and point D? Express your answer in volts. ANSWER: = Hint B.2 Potential difference and work Recall that the potential difference (in volts) between a point and a point equals the work (in joules) done by the electric force to move a 1- charge from to . Express your answer in joules. ANSWER: = Part C The magnitude of the electric field at point C is Hint C.1 Electric field and equipotential surfaces Since the diagram shows equal potential differences between adjacent surfaces, equal amounts of work are done to move a particular charge from one surface to the next adjacent one. It follows then that if the equipotentials are closer together, the electric force does the same amount of work in a smaller displacement than if the equipotentials were farther apart. Therefore, the electric force, as well as the corresponding electric field, has a larger magnitude. ANSWER: greater than the magnitude of the electric field at point B. less than the magnitude of the electric field at point B. equal to the magnitude of the electric field at point B. unknown because the value of the electric potential at point C is unknown. Exercise 23.14 Description: Identical point charges q = 15.00mu C are placed at opposite corners of a square. The length of each side of the square is 0.200 m. A point charge q_0 = - 2.00mu C is placed at one of the empty corners. (a) How much work is done on q_0 by the...
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