PHYSICS 240 Midterm: PHYS 240 University of Michigan Winter 2006 f03 Exam3 1
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Instructions: fill in your name above, this will be a 1. 5 hour, closed book exam. You can write on both sides of the card if you like: you will be asked to show your university student id card when you turn in your exam. 0 = 8. 85 x 10-12 c2/nm2 k = 1/(4 0) qelectron=-1. 6 x 10-19 c qproton=1. 6 x 10-19 c melectron=9. 1 x 10-31 kg mproton=1. 67 x 10-27 kg. 1: imagine a long wire with radius r in which the current density j increases linearly from zero at the center of the wire to some value jedge at the outer edge. 2: a small bar magnet is dropped, north pole down, towards the centers of several different loops of wire, each of which is held fixed in place. Loop a has resistance r, loop b has resistance 2r, and loop c has a small break in it.
