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# Quiz20 - Version 001 Quiz 20 sizemore(22956 This print-out...

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Version 001 – Quiz 20 – sizemore – (22956) 1 This print-out should have 6 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. BarMovinginaField 001(part1of2)10.0points A straight rod moves along parallel conduct- ing rails, as shown below. The rails are con- nected at the left side through a resistor so that the rod and rails form a closed rectangu- lar loop. A uniform field perpendicular to the movement of the rod exists throughout the region. Assume the rod remains in contact with the rails as it moves. The rod experiences no friction or air drag. The rails and rod have negligible resistance. 7 . 1 g 9 . 5 Ω 3 . 8 T 3 . 8 T 0 . 32 A 0 . 79 m At what speed should the rod be moving to produce the downward current in the resistor? Correct answer: 1 . 01266 m / s. Explanation: Let : I = 0 . 32 A , = 0 . 79 m , m = 7 . 1 g , R = 9 . 5 Ω , and B = 3 . 8 T . m R B B I From Ohm’s Law, the emf inside the loop is E = IR. and the motional emf is E = Bℓv. Thus the velocity of the rod is v = E Bℓ = IR Bℓ = (0 . 32 A) (9 . 5 Ω) (3 . 8 T) (0 . 79 m) = 1 . 01266 m / s . 002(part2of2)10.0points The rod is 1. moving to the left. correct 2. moving to the right. 3. stationary. 4. moving either left or right, since both directions produce the same result.

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Quiz20 - Version 001 Quiz 20 sizemore(22956 This print-out...

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