PHYS 208 Midterm: PHYS 208 TAMU Exam 3 2009
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[1] (25 points) an infinitely long, extremely thin wire carries a current i. It has the shape shown below, consisting of two straight, parallel segments, which are very close together, extending from x = 0 to infinity, and a circular section of radius r. Ignoring gravity, if there were an electric field in the positive y direction with magnitude e0, find a magnetic field that could be added so that the particle"s velocity would be unchanged. [2] (25 points) a very long wire has a current i which is uniformly spread over its cross section. It has a radius h. a second very long, thin wire is placed a distance w from the first wire. It also has a current i in the same direction. i into page i into page. I" x=o x=w (a) find the magnetic field made by the first wire everywhere. (b) find of the points where the total magnetic field be zero.
