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QTest #4-solutions

# QTest #4-solutions - Version 085/ABBBB – QTest#4 –...

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Unformatted text preview: Version 085/ABBBB – QTest #4 – Antoniewicz – (56495) 1 This print-out should have 3 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 (part 1 of 2) 5.0 points Suppose that a uniform wire of resistance R is stretched uniformly to N times its original length. Assume the total volume of the wire re- mains the same, and the volume is given by the product of the cross sectional area and the length. Denote the original area by A and the area after the stretch by A ′ . The ratio A ′ A is 1. A ′ A = 1 N 2 2. A ′ A = N 3. A ′ A = 1 √ N 4. A ′ A = 1 N 2 / 3 5. A ′ A = N 3 / 2 6. A ′ A = 1 7. A ′ A = 0 8. A ′ A = 1 N correct 9. A ′ A = N 2 10. A ′ A = √ N Explanation: Let : ℓ ′ = N ℓ . The volume before the stretch is V = A ℓ where ℓ is the length. The volume after the stretch is V ′ = A ′ ℓ ′ = A ′ N ℓ....
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QTest #4-solutions - Version 085/ABBBB – QTest#4 –...

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