2212_Test4 - PHYS 2212 Test 4 Dec 1st 2010 Name(print)...

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Unformatted text preview: PHYS 2212 Test 4 Dec 1st 2010 Name(print) Instructions • Read all problems carefully before attempting to solve them. • Your work must be legible, and the organization must be clear. • You must show all work, including correct vector notation. • Correct answers without adequate explanation will be counted wrong. • Incorrect work or explanations mixed in with correct work will be counted wrong. Cross out anything you don’t want us to read! • Make explanations correct but brief. You do not need to write a lot of prose. • Include diagrams! • Show what goes into a calculation, not just the final number, e.g.: a · b c · d = (8 × 10- 3 )(5 × 10 6 ) (2 × 10- 5 )(4 × 10 4 ) = 5 × 10 4 • Give standard SI units with your results. Unless specifically asked to derive a result, you may start from the formulas given on the formula sheet, including equations corresponding to the fundamental concepts. If a formula you need is not given, you must derive it. If you cannot do some portion of a problem, invent a symbol for the quantity you can’t calculate (explain that you are doing this), and use it to do the rest of the problem. Honor Pledge “In accordance with the Georgia Tech Honor Code, I have neither given nor received unauthorized aid on this test.” Sign your name on the line above PHYS 2212 Do not write on this page! Problem Score Grader Problem 1 (25 pts) Problem 2 (25 pts) Problem 3 (25 pts) Problem 4 (25 pts) Problem 1 (25 Points) A bar made out of a conducting ma- terial is 0.21 m high with a rectan- gular cross section 0.05 m wide and 0.004 m deep. The bar is part of a cir- cuit and carries a steady current (the diagram shows only part of the cir- cuit). A uniform magnetic field of 0.95 tesla is applied perpendicular to the bar, going into the page (using some coils that are not shown). Two volt- meters are connected along and across the bar and read steady voltages as shown (mV = millivolt = 10- 3 volt). The connections across the bar were carefully placed directly across from each other to eliminate false readings corresponding to the much larger volt- age along the bar. Assume that there is only one kind of mobile charge in this material. Voltmeter +0.031 mV B applied = 0.95 T 0.21 m 0.05 m . 4 m Voltmeter –2.7 V to power supply to power supply (a 5pts) What is the sign of the mobile charges, and which way do they move? To receive full credit, explain your answer with a supporting diagram. (b 5pts) What is the drift speed v of the mobile charges? Explain your reasoning. (c 5pts) What is the mobility u of the mobile charges? (d 5pts) The current running through the bar was measured to be 0.55 ampere. If each mobile charge is singly charged ( | q | = e ), how many mobile charges are there in 1 m 3 of this material?...
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This note was uploaded on 05/23/2011 for the course PHYISCS 2212 taught by Professor Shatz during the Spring '10 term at Georgia Tech.

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2212_Test4 - PHYS 2212 Test 4 Dec 1st 2010 Name(print)...

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