CH19 HW2 - WebAssign Ch19 HW2 S2010 (Homework) Kiyaniah...

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Unformatted text preview: WebAssign Ch19 HW2 S2010 (Homework) Kiyaniah Tilghman PY 208, section 003M, Spring 2010 Instructor: Keith Weninger Current Score : 13 / 13 Due : Thursday, February 25, 2010 12:30 PM EST About this Assignment Extension Requests Question Points 12345 33322 Total 13/13 (100.0%) Description Current and electric fields in circuits; node rule; surface charges in circuits Instructions Reading: Sec. 19.1-19.7 NOTE: PLEASE READ! In question 1, if the diagram does not have letters near the "x"s in the circuit, assume the labeling scheme is the same as it is in question 2. Also, question 3 is missing an answer choice, namely choice "i". Don't worry about this--"i" is an incorrect choice. The due date for this assignment is past. Your work can be viewed below, but no changes can be made. 1. 3/3 points All Submissions Notes Question: MI3 19.X.049 A steady-state current flows through the Nichrome wire in the circuit shown in the figure. Before attempting to answer these question, draw a copy of this diagram. All of the locations indicated by letters are inside the wire. (a) On your diagram, show the electric field at the locations indicated, paying attention to relative magnitude. (b) Carefully draw pluses and minuses on your diagram to show the approximate surface charge distribution that produces the electric field you drew. Make your drawing show clearly the differences between regions of high surface charge density and regions of low surface charge density. Use your diagram to answer the following question: Which of the following statments about this circuit are true? There is some excess negative charge on the surface of the wire near location B. There is no excess charge on the surface of the wire. Inside the metal wire the magnitude of the electric field is zero. Because the current is not changing, the circuit is in static equilibrium. The magnitude of the electric field is the same at locations A and E. The electric field at location D points to the left . The magnitude of the electric field inside the wire is larger at location G than at location C. The electric field points to the left at location A. There is excess charge on the surface of the wire near the batteries, but nowhere else. 2. 3/3 points All Submissions Notes Question: MI3 19.X.050 In the circuit shown in the figure, all of the wires are made of Nichrome, but one wire is very thin and the others are thick. Before attempting to answer these questions, draw a copy of this diagram. All of the locations indicated by letters are inside the wire. (a) On your diagram, show the electric field at the locations indicated, paying attention to relative magnitude. (b) Carefully draw pluses and minuses on your diagram to show the approximate surface charge distribution that produces the electric field you drew. Make your drawing show clearly the differences between regions of high surface charge density and regions of low surface charge density. Use your diagram to answer the following question: Which of the following statements about this circuit are true? The electron current is the same at every location in this circuit. The electron current in this circuit is less than the electron current would be if all the wires were thick. The magnitude of the electric field at location D is larger than the magnitude of the electric field at location G There is no surface charge at all on the wire near location G . The magnitude of the electric field at location G is smaller in this circuit than it would be if all the wires were thick. Fewer electrons per second pass location E than location C. The magnitude of the electric field is the same at every location in this circuit. There is a large gradient of surface charge on the wire between locations C and E. 3. 3/3 points All Submissions Notes Question: MI3 19.X.039 In the circuit below the narrow resistor is made of the same material as the thick connecting wires. In the steady state, which graphs correctly show the magnitude of the electric field at locations around the circuit, and the drift speed of the electrons at locations around the circuit? Select the two correct graphs. Drift speed: Electric field: ( a) ( b) ( c) ( d) ( e) (f) ( g) ( h) ( i) ( j) ( k) ( l) 4. 2/2 points All Submissions Notes Question: MI3 19.X.051.alt01 In the circuit shown below a mechanical battery keeps a steady-state current running in a wire which has rather low electron mobility. Which of the following statements about the circuit are true? Select all that apply. The electric field is zero at all locations inside the metal wire. The electric field inside the wire varies in magnitude, depending on location. The nonzero electric field inside the wire is created by the moving electrons in the wire. At every location inside the wire the direction of the electric field is parallel to the wire. The magnitude of the electric field inside the wire is the same at all locations inside the wire. At location 3 the electric field points to the left. At location 3 inside the wire the electric field points to the right. 5. 2/2 points All Submissions Notes Question: MI3 19.X.001 Write the node equation for the circuit in the figure. If I 1 = 6 A, I 4 = 4 A, and I 3 = 5 A, what is the value of the outward-going current I 2 ? 5 5A ...
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This note was uploaded on 09/21/2010 for the course PY 005 taught by Professor Mattewk. during the Spring '10 term at N.C. State.

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