aaa phys - University of Minnesota School of Physics and...

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University of Minnesota Name: School of Physics and Astronomy ID No.: Physics 1302, Spring 2006, Section 300 TA Name: Hour Exam 4 1. A section of a wire is bent into a semi-circle with a radius of 5 cm. The wire is then placed in a magnetic field of 0.10 T in such a way that the semi-circular piece of the wire can be rotated about an axis perpendicular to the magnetic field. The ends of the wire are connected, using “brush contacts,” to an R =10 Ω resistor, which lies outside the magnetic field region. (a) The wire makes 5 revolutions per second. What is the angular velocity ω ? (5 points) (b) What is the difference between the maximum flux and the minimum flux through the loop that includes the bent wire and the resistor? (5 points) (c) Write an equation that describes the changing flux as a function of time. (5 points) (d) What is the voltage across the resistor as a function of time? (5 points) (e) What is the current through the resistor as a function of time? (5 points)
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This note was uploaded on 10/07/2009 for the course PHYS 1302W taught by Professor Marshak during the Spring '08 term at Minnesota.

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aaa phys - University of Minnesota School of Physics and...

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