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Unformatted text preview: 1 Midterm #2 Physics 9HD, Fall 2007 Nov. 28, 2007 NAME_______________________________________________________________________ You are permitted to use one 8 /1/2 x 11 sheet of paper with formulas, and your calculator. MAXIMUM SCORE IS 100 POINTS SHOW ALL YOUR WORK. Please hand in your copy of the test with your work, so that I can see any additions which you have made to the diagrams (e.g., assignment of currents, nodes, and loops for Problem 5.) ______________________________________________________________________________ 1. (5 points) Use Amperes Law to derive the magnetic field inside an infinitely long solenoid of radius b with n turns/length of current I. Assume all quantities are given in CGS units, i.e., current in esu/sec, radius b in cm, and n turns/cm. 2. (15 points) (a) Find the force between 2 parallel wires of length L, one with current I 1 and the other with current I 2 . Assume both currents flow in the same direction, and that the wires are separated by distance a....
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