online assignment 3-2

online assignment 3-2 - MasteringPhysics: Assignment Print...

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Manage this Assignment: 2a. Electric Potential Due: 11:00pm on Sunday, January 17, 2010 Note: To understand how points are awarded, read your instructor's Grading Policy . Print Version with Answers 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? Express your answer in joules. Hint A.1 Find the potential difference between A and B What is the potential difference between point A and point B? Express your answer in volts. Hint A.1.1 Equipotential surfaces Recall that an equipotential surface is a surface on which the electric potential is the same at every point. 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 . Page 1 of 16 MasteringPhysics: Assignment Print View 1/8/2010 http://session.masteringphysics.com/myct/assignmentPrint?assignmentID=1327039
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ANSWER: = Part B What is the work done by the electric force to move a 1- charge from A to D? Express your answer in joules. Hint 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 . 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. Energy Stored in a Charge Configuration
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This note was uploaded on 07/01/2010 for the course PHYS 101213 taught by Professor Bratton during the Spring '10 term at CSU Chico.

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online assignment 3-2 - MasteringPhysics: Assignment Print...

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