33-04fin

# 33-04fin - Physics 33 Final Exam Monday December 6 2004...

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Physics 33 Final Exam Name _______________________________ Monday, December 6, 2004 This test is closed book, closed notes. No calculators, please, except for the estimation problem. (On your honor!) You may use a handwritten, 3” by 5” card. Leave any π ’s in answers as π . USE NO PHYSICAL CONSTANTS OTHER THAN THOSE GIVEN. If any numerical values are given in a problem, a numeric answer is expected. FULL CREDIT WILL NOT BE GIVEN for answers that contain mathematical operations! For full credit, you must explain or show how your answers are obtained. Do not state the result of a homework, in-class, or textbook problem without proof! What to do if you run out of room on a page: FLIP your test and write on the back. (Which means you shouldn’t write on the back of the page on which you just ran out of room!) Some possibly numbers: k (Coulomb constant) = 9 x 10 9 Nm 2 /C 2 ε 0 (permittivity constant) = 9 x 10 -12 C 2 /Nm 2 This test consists of 7 numbered questions on 8 pages!

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Physics 33 Final Exam Initials ______ Monday, December 6, 2004 1) (15 points) Two long, straight, parallel wires are a distance D = 12 m apart as shown. Wire 1 carries a current i 1 = 10 A out of the page; wire 2 carries a current i 2 = 7 A into the page. Find the location of all points in space in the region near the wires at which the magnitude of the magnetic field equals zero. 2 D i 1 i 2
Physics 33 Final Exam Initials ______ Monday, December 6, 2004 2) (15 points) Two vertical, parallel conducting rails are connected at one end; a conducting bar of length L, mass M, and resistance R is attached so that it can slide up and down without friction. The rails offer no resistance.

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