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Unformatted text preview: Kapoor (mk9499) oldhomework 12 Turner (60230) 1 This print-out should have 11 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. 001 10.0 points Why are thick wires rather than thin wires usually used to carry large current? 1. Thick wires are difficult to break. 2. Thick wires are easier to make. 3. Thick wires have a larger heat capacity. 4. Thick wires have less resistance. correct Explanation: Thick wires have less resistance and will more effectively carry currents without exces- sive heating. 002 10.0 points A resistor is made from a hollow cylinder of length l , inner radius a , and outer radius b . The region a < r < b is filled with material of resistivity . Current runs along the axis of the cylinder. The resistance R of this component is 1. R = a 2 2. R = b 2 3. R = ( b 2- a 2 ) 4. R = 2 ( b 2- a 2 ) 5. R = b 2 a 4 6. R = 2 b 2 7. R = a b 2 8. R = a 2 b 4 9. R = b 2 10. R = ( b 2- a 2 ) correct Explanation: By definition R = A = b 2- a 2 = ( b 2- a 2 ) ....
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