physics7B-sp09-final-Huang-soln

physics7B-sp09-final-Huang-soln - 1 1 Huang Spring 2009...

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Unformatted text preview: 1 1 Huang, Spring 2009 Final, Problem 1 (15 points) Solution by: Kevin Grosvenor A conducting rod with mass m is free to slide on two parallel rails separated by a distance L with negligible friction. At the right end of the rails, a voltage source of strength V in series with a resistor of resistance R makes a closed circuit together with the rails and the rod. The rails and the rod are taken to be perfect conductors. The rails extend to infinity on the left. There is a uniform magnetic field of magnitude B , pervading all space perpendicular to the plane of rod and rails. The rod is released from rest, and it is observed that it accelerates to the left. (a) [3 pts] In what direction does the magnetic field point? (1 pt) The direction of current goes from the + end of the battery, around the circuit, to the- end of the battery. This would be counter-clockwise in this case. Thus, the current in the rod is going DOWN....
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This note was uploaded on 12/14/2011 for the course PHYSICS 7B taught by Professor Packard during the Fall '08 term at Berkeley.

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physics7B-sp09-final-Huang-soln - 1 1 Huang Spring 2009...

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