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Unformatted text preview: 'T ! Physics 21[4 Spring 2009 Midterm Exam 3 Dr. Bandy Pagel.. Problem 2 (See Fig. 2, Parts a-t) (36 points) A 20-em-long, zero-resistance conducting slide moves outward, on zero-resistance rails, at a steady speed of 10 mls in a 100 m T magnetic field maintained by a fixed bar magnet. On the opposite side, a 2.0 Q carbon resistor completes the circuit by connecting the two rails. a. Find the motional emf b. What is the direction and magnitude of the induced current in the circuit? c. Draw the F B and it on the slide at position A on the figure. d. How much force is needed to pull the wire at this speed? e. Find the energy loss due to heat generated in the resistor in 1.0 s. f. If the bar magnet is withdrawn from the system so that the magnetic field decreases (into the page), explain the effect if any. / j , i ! '.J,> Cj'JS,' x x x x x x ~ x x x x x # x x x x x X I t X X X X Figure 2 I 7 ....
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This note was uploaded on 01/10/2012 for the course PHYS 2114 taught by Professor Bandy during the Spring '08 term at Oklahoma State.
- Spring '08