exam3 - Physics 2306 Name Exam 3(Arsenault Student ID...

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Physics 2306 Exam 3 (Arsenault) Spring 2006 Name Student ID Check your (CRN) section number (- 2 points if not checked): CRN time 14291 8:00 – 8:50 14288 9:05 – 9:55 14296 10:10 – 11:00 14295 11:15 – 12:05 Students may also use their own two sided 8.5” x 11” formula sheet in addition to the formula sheet that is on the last 2 pages of this. 1

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Physics 2306 Exam 3 (Arsenault) Spring 2006 1,2. Coaxial Cable : A solid conductor with radius a is supported by insulating disks on the axis of a conducting tube with inner radius b and outer radius c. The central conductor and tube carry equal currents I in opposite directions. The currents are distributed uniformly over the cross sections of each conductor. 1. Find an expression for the magnitude of the magnetic field as a function of the radial distance from the center of the inner conductor, r , for a < r < b : 1 0 6 NI 2 I/(2 r 2 ) 7 I/(4 r 2 ) 3 I/(2 r) 8 I/(4 r) 4 I/(2  r) 9 I/(4  r) 5 I/(2  r 2 ) 10 I/(4  r 2 ) 2. Find an expression for the magnitude of the magnetic field as a function of the radial distance from the center of the inner conductor, , for r > c : 1 0 6 NI 2 I/(2 r) 7 I/(4 r) 3 I/(2 r 2 ) 8 I/(4 r 2 ) 4 I/(2  r) 9 I/(4  r) 5 I/(2  r 2 ) 10 I/(4  r 2 ) 2 a b c I I
Spring 2006 3-5 As in a lecture demonstration: After a long time the switch, s , above, is closed. 3. What is the current going through the inductor at the instant the switch is closed? 1 0 6 1 A 2 0.01 A 7 6 A 3 0.06 A 8 10 A 4 0.1 A 9 30 A 5 0.6 A 10 60 A 4. A long time after the switch is closed, what is the power emitted by the light bulb? 1

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This note was uploaded on 03/19/2008 for the course PHYS 2306 taught by Professor Ykim during the Fall '06 term at Virginia Tech.

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exam3 - Physics 2306 Name Exam 3(Arsenault Student ID...

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