PH 102 Midterm: ph102_S15_exam3
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Instructions: solve three of the ve problems below, all problems have equal weight. Do your work on separate sheets: you are allowed 1 sheet of standard 8. 5 11 in paper and a calculator. (cid:3) 1. Two parallel rails with negligible resistance are a distance d apart and connected by a resistor. The circuit also contains two metal rods, of resistance rl and rr, begin pulled away from the resistor at speeds of v1 and v2, respectively. A uniform magnetic eld b is applied into the plane of the gure. Determine the current in the central resistor rm. Find the force on a square loop (side a) placed as shown below, near an in nite straight wire. Both loop and wire carry a steady current i. In a mass spectrometer, a beam of ions is rst made to pass through a velocity selector with perpendicular ~e and ~b elds. Here, the electric eld ~e is to the right, between parallel charged.
