group - the loop normal to a line connecting the poles The...

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University of Minnesota Names: School of Physics and Astronomy Physics 1302, Spring 2008, Section 300 TA: Hour Exam 4—Group Problem The principle of electromagnetic induction, that is the ability to generate an electric field and thus an electric current with a changing magnetic flux, is essential to much modern technology. Although electrical energy can be generated in other ways (friction, solar cells, chemical reactions, etc.), most electrical energy used by our society comes from generators based on electromagnetic induction. What follows is a simplified problem using this principle, which is also known as Faraday’s Law. A loop of wire with an area of 120 cm 2 is placed between the poles of a magnet with the plane of
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Unformatted text preview: the loop normal to a line connecting the poles. The magnetic field in the area of the loop is 0.80 T. (a) What is the peak emf generated if the plane of the wire loop is rotated at 600 rpm? (5 points) (b) Assume that the wire has a resistance of 0.10 ohms/m and that the wire loop forms a circle. What is the maximum current through the loop when it is rotated at 600 rpm? (5 points) (c) What are the peak and average electrical power dissipations when the loop is rotated at 600 rpm? (3 points each) (d) A small cut is made in the loop and a 5 ohm resistor is placed in series with the loop to bridge the cut. How much mechanical energy is required to turn the loop at 600 rpm for 10 seconds? (9 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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