This preview has intentionally blurred sections. Sign up to view the full version.
View Full Document
Unformatted text preview: Version 085/ABBBB – QTest #4 – Antoniewicz – (56495) 1 This printout should have 3 questions. Multiplechoice 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....
View
Full Document
 Spring '10
 ANTONIEWICZ
 Physics, ρ, A′, 1013 W, R N

Click to edit the document details