This preview shows pages 1–2. Sign up to view the full content.
This preview has intentionally blurred sections. Sign up to view the full version.View Full Document
Unformatted text preview: mcconnell (kam2342) 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 have a larger heat capacity. 2. Thick wires are easier to make. 3. Thick wires have less resistance. correct 4. Thick wires are difficult to break. 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 = ( b 2- a 2 ) correct 2. R = ( b 2- a 2 ) 3. R = b 2 a 4 4. R = a b 2 5. R = b 2 6. R = 2 ( b 2- a 2 ) 7. R = a 2 b 4 8. R = a 2 9. R = 2 b 2 10. R = b 2 Explanation: By definition R = A = b 2- a 2 = ( b 2- a 2 ) ....
View Full Document
This note was uploaded on 11/22/2010 for the course PHYS 303 taught by Professor Turner during the Spring '10 term at University of Texas at Austin.
- Spring '10