oldhw12 - oldhomewk 12 LEE, BENJAMIN Due: Sep 30 2007, 4:00...

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Unformatted text preview: oldhomewk 12 LEE, BENJAMIN Due: Sep 30 2007, 4:00 am 1 Question 1, chap -1, sect -1. part 1 of 1 10 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 have a larger heat capacity. 3. Thick wires are easier to make. 4. Thick wires have less resistance. correct Explanation: Thick wires have less resistance and will more effectively carry currents without exces- sive heating. Question 2, chap 27, sect 2. part 1 of 1 10 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 4 2. R = b 2 3. R = a 2 4. R = b 2 5. R = ( b 2- a 2 ) correct 6. R = a b 2 7. R = a 2 b 4 8. R = 2 ( b 2- a 2 ) 9. R = 2 b 2 10. R = ( b 2- a 2 ) Explanation: By definition R = A = b 2- a 2 = ( b 2- a 2 ) . Question 3, chap 27, sect 3. part 1 of 1 10 points Which of the following will cause the elec- tric resistance of certain materials known as superconductors to suddenly decrease to es- sentially zero?sentially zero?...
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This note was uploaded on 04/07/2008 for the course PHY 303K taught by Professor Turner during the Fall '07 term at A.T. Still University.

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oldhw12 - oldhomewk 12 LEE, BENJAMIN Due: Sep 30 2007, 4:00...

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