Physics for Scientists and Engineers With Modern Physics
9th Edition
ISBN: 9781133953982
Author: SERWAY, Raymond A./
Publisher: Cengage Learning
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Chapter 27, Problem 6OQ
To determine
The wire which has the smallest resistance.
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Wire B has twice the length and twice the radius of wire A. Both wires are made from the same material. If wire A has a resistance R, what is the resistance of wire B?
(a) 4R
(b) 2R
(c) R (d) 1/2R
(e) 1/4R.
A cylindrical wire has a radius r and length ℓ. If both r and ℓ are doubled, does the resistance of the wire (a) increase, (b) decrease, or (c) remain the same?
A copper wire of length 4.635 m and diameter 6.53 mm must be replaced by a new wire, also made of copper, but exactly 5 times longer. The resistance between the two ends must remain the same, so what diameter must be chosen for the new wire? Give your answer in mm.
Chapter 27 Solutions
Physics for Scientists and Engineers With Modern Physics
Ch. 27.1 - Consider positive and negative charges of equal...Ch. 27.2 - Prob. 27.2QQCh. 27.2 - Prob. 27.3QQCh. 27.4 - When does an incandescent lightbulb carry more...Ch. 27.6 - Prob. 27.5QQCh. 27 - Prob. 1OQCh. 27 - Prob. 2OQCh. 27 - Prob. 3OQCh. 27 - Prob. 4OQCh. 27 - Prob. 5OQ
Ch. 27 - Prob. 6OQCh. 27 - Prob. 7OQCh. 27 - Prob. 8OQCh. 27 - Prob. 9OQCh. 27 - Prob. 10OQCh. 27 - Prob. 11OQCh. 27 - Prob. 12OQCh. 27 - Prob. 13OQCh. 27 - Prob. 1CQCh. 27 - Prob. 2CQCh. 27 - Prob. 3CQCh. 27 - Prob. 4CQCh. 27 - Prob. 5CQCh. 27 - Prob. 6CQCh. 27 - Prob. 7CQCh. 27 - Prob. 8CQCh. 27 - Prob. 1PCh. 27 - A small sphere that carries a charge q is whirled...Ch. 27 - Prob. 3PCh. 27 - Prob. 4PCh. 27 - Prob. 5PCh. 27 - Prob. 6PCh. 27 - Prob. 7PCh. 27 - Prob. 8PCh. 27 - The quantity of charge q (in coulombs) that has...Ch. 27 - Prob. 10PCh. 27 - Prob. 11PCh. 27 - Prob. 12PCh. 27 - Prob. 13PCh. 27 - Prob. 14PCh. 27 - A wire 50.0 m long and 2.00 mm in diameter is...Ch. 27 - A 0.900-V potential difference is maintained...Ch. 27 - Prob. 17PCh. 27 - Prob. 18PCh. 27 - Prob. 19PCh. 27 - Prob. 20PCh. 27 - Prob. 21PCh. 27 - Prob. 22PCh. 27 - Prob. 23PCh. 27 - Prob. 24PCh. 27 - Prob. 25PCh. 27 - Prob. 26PCh. 27 - Prob. 27PCh. 27 - While taking photographs in Death Valley on a day...Ch. 27 - Prob. 29PCh. 27 - Prob. 30PCh. 27 - Prob. 31PCh. 27 - Prob. 32PCh. 27 - Prob. 33PCh. 27 - Prob. 34PCh. 27 - At what temperature will aluminum have a...Ch. 27 - Assume that global lightning on the Earth...Ch. 27 - Prob. 37PCh. 27 - Prob. 38PCh. 27 - Prob. 39PCh. 27 - The potential difference across a resting neuron...Ch. 27 - Prob. 41PCh. 27 - Prob. 42PCh. 27 - Prob. 43PCh. 27 - Prob. 44PCh. 27 - Prob. 45PCh. 27 - Prob. 46PCh. 27 - Prob. 47PCh. 27 - Prob. 48PCh. 27 - Prob. 49PCh. 27 - Prob. 50PCh. 27 - Prob. 51PCh. 27 - Prob. 52PCh. 27 - Prob. 53PCh. 27 - Prob. 54PCh. 27 - Prob. 55PCh. 27 - Prob. 56PCh. 27 - Prob. 57APCh. 27 - Prob. 58APCh. 27 - Prob. 59APCh. 27 - Prob. 60APCh. 27 - Prob. 61APCh. 27 - Prob. 62APCh. 27 - Prob. 63APCh. 27 - Review. An office worker uses an immersion heater...Ch. 27 - Prob. 65APCh. 27 - Prob. 66APCh. 27 - Prob. 67APCh. 27 - Prob. 68APCh. 27 - Prob. 69APCh. 27 - Prob. 70APCh. 27 - Prob. 71APCh. 27 - Prob. 72APCh. 27 - Prob. 73APCh. 27 - Prob. 74APCh. 27 - Prob. 75APCh. 27 - Prob. 76APCh. 27 - Review. A parallel-plate capacitor consists of...Ch. 27 - The dielectric material between the plates of a...Ch. 27 - Prob. 79APCh. 27 - Prob. 80APCh. 27 - Prob. 81APCh. 27 - Prob. 82CPCh. 27 - Prob. 83CPCh. 27 - Material with uniform resistivity is formed into...Ch. 27 - Prob. 85CP
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- A length of copper wire has a resistance 24 Ω. The wire is cut into three pieces of equal length, which are then connected as parallel lengths between points A and B. What resistance will this new “wire” of length L0 3 have between points A and B? Answer in units of Ω.arrow_forwardAn electrician wishes to cut a copper wire (ρ=1.72×10-8 Ωm) that has 10Ω of resistance. The wire has a radius of 0.625mm. Approximately what length of wire has a resistance equal to the maximum 10Ω ? The length of the copper wire having a resistance of 10Ω is =arrow_forwardAn aluminum rod with a square cross section is 1.3 m long and 5.2 mm on edge. (a) What is the resistance between its ends? (b)What must be the diameter of a cylindrical copper rod of length 1.3 m if its resistance is to be the same as that of the aluminum rod?arrow_forward
- Suppose you wish to fabricate a uniform wire from 2.40 g of copper. The wire is to have a resistance of R = 0.700 Ω and all the copper is to be used. (a) What must be the length of this wire? m(b) What must be the diameter of this wire?arrow_forwardYou have an aluminum bar of dimensions 2.0 cm × 5.0 cm × 10 cm. You want to insert it into an electric circuit so that it will have the smallest possible resistance. Which pair of opposite faces should you connect to the circuit?arrow_forwardTwo metallic wires made from copper have same length but the radius of wire 1 is half of that of wire 2. The resistance of wire 1 is R. If both the wires are joined together in series, the total resistance becomes: A) 2R B) R/2 C) 5R/4 D) 3R/4arrow_forward
- Suppose you wish to fabricate a uniform wire from 1.10 g of copper. The wire is to have a resistance of R = 0.540 Ω and all the copper is to be used. (a) What must be the length of this wire? m(b) What must be the diameter of this wire? µmarrow_forwardV-I Curve for two conductors A and B is shown. Which of the two conductors will have more resistance : A 60 30% (В) В (D) None of these (A) A (C) Both have same resistancearrow_forwardWire 1 has a length L and a circular cross section of diameter D. Wire 2 is constructed fromthe same material as wire 1 and has the same shape, but its length is 2L and its diameter is2D. Is the resistance of wire 2 the same as that of wire 1, twice that of wire 1, or half that ofwire 1?arrow_forward
- Five cylindrical wires are made of the same material. Their lengths and radii are: Wire 1: length e, radius r. Wire 2: length 4, radius ri2. Wire 3: length l2, radius r/2. Wire 4: length €, radius r/2. Wire 5: length 5€, radius 2r Rank the wires according to their resistances, from least to greatest. (А) 1, 2, 3, 4, 5. (B) 1, 2, 4, 3, 5. (C) 1, 3, 4, 2, 5. (D) 5, 4, 3, 2, 1. (E) 1 and 2 tie, then 5, 3, 4.arrow_forwardA certain wire has a resistance of 140 Ω. What is the resistance of a second wire, made of the same material, that is 1/4 as long and has 1/4 the diameter?arrow_forwardQuestion #10. If a 30 resistor is placed between R1 and R2, while a 20 Q resistor is between R3 and R4, what is the new equivalent resistance between point A and B? R2 R3 10Ω R1 R4 A 402arrow_forward
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