33-08_fin

# 33-08_fin - Seat letter and number Physics 33 Final Exam...

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Seat letter and number Physics 33 Final Exam Name ________________________ Monday, December 8, 2008 1 This test is closed book, closed notes. You may use a 3” by 5” hand-written card. 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! Do not state the result of a homework, in-class, or textbook problem without proof! For this test, you might need these physical constants: k (Coulomb constant) = 8.9 × 10 9 Nm 2 /C 2 ε 0 (permittivity constant) = 8.85 × 10 –12 C 2 /Nm 2 e (fundamental charge) = 1.6 × 10 –19 C μ (permeability constant) = 1.26 × 10 –6 Tm/A 0 If you run out of room on a page: FLIP your test and continue writing. That is, if you run out of space on page N, continue on the back of page N - 1! This test consists of 6 numbered questions on 8 pages! This cartoon is copyright Randall Munroe and used under a claim of Fair Use. This and other xkcd cartoons can be found online at xkcd.com.

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Physics 33 Final Exam Name ________________________ Monday, December 8, 2008 2 1) (15 points) Researchers at AUU (Alternate Universe University) have just announced the invention of the reziztor, a new electronic component. Circuits that contain reziztors work the same way as circuits we have studied, except that the relationship between current i , reziztance R , and applied voltage V is Vai R = , where the constant a has value 1 with appropriate SI units. Show that the equivalent reziztance of two reziztors R and R in parallel is 1 2 () 12 1 22 2 equiv RR R = + .
Physics 33 Final Exam Name ________________________ Monday, December 8, 2008 3 2) (20 points) CHOOSE EITHER A OR B!! (Only one will be graded.) A. Long straight wires… 0 i μ = BdA K K i v a) (8 points) Use Ampere’s Law ( ) to show that the magnitude of the magnetic field a distance r from a long straight wire and far from its ends is 00 2 i B r π = .

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## This note was uploaded on 02/09/2010 for the course PHYS 44421 taught by Professor Kesten during the Spring '09 term at Santa Clara.

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33-08_fin - Seat letter and number Physics 33 Final Exam...

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