Which of the following statements is/are ALWAYS TRUE for the resistivity and conductivity of a material? I. The resistivity of a material is temperature-dependent. II. The conductivity of a material is temperature- dependent. II. As the resistivity of a material increases. its conductivity decreases. A. Tand II only B. Iand III only C. Il and III only D. I, II, and III

Which of the following statements is/are ALWAYS TRUE for the resistivity and conductivity of a material? I. The resistivity of a material is temperature-dependent. II. The conductivity of a material is temperature- dependent. II. As the resistivity of a material increases. its conductivity decreases. A. Tand II only B. Iand III only C. Il and III only D. I, II, and III

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter17: Current And Resistance

Section: Chapter Questions

Problem 58AP

See similar textbooks

Similar questions

The current I is measured through a sample of an ohmic material as a voltage V is applied, (a) What is the current when the voltage is doubled to 2V (assume the change in temperature of the material is negligible)? (b) What is the voltage applied is the current measured is 0.27 (assume the change in temperature of the material is negligible)? What will happen to the current if the material if the voltage remains constant, but the temperature of the material increases significantly?
Unreasonable Results (a) To what temperature must you raise a resistor made of constantan to double its resistance, assuming a constant temperature coefficient of resistivity? (b) To cut it in half? (c) What is unreasonable about these results? (d) Which assumptions are unreasonable, or which premises are inconsistent?
A 220. V potential difference is applied to a space heater that dissipates 440. W during operation.(a) What is resistance during operation?(b) At what rate do electrons flow through any cross-section of the heater element? (c) The space heater has a resistance of 27.5 Ω at 25.0 °C and the temperature coefficient of resistivity is α = 4.50x10^-3 °C^-1. What is the temperature of the space heater internal elements?
A 50.0 - g sample of a conducting material is all that is available.The resistivity of the material is measured to be 11 x 10-8 Ω ⋅ m,and the density is 7.86 g/cm3. The material is to be shapedinto a solid cylindrical wire that has a total resistance of 1.5 Ω.(a) What length of wire is required? (b) What must be thediameter of the wire?
An aluminum wire with a diameter of 0.085 mm has a uniform electric field of 0.285 V/m imposed along its entire length. The temperature of the wire is 55.0 degrees Celsius. Assume one free electron per atom. (a) Use the information in Table 26.2 to determine the resistivity of aluminum at this temperature. (b) What is the current density in the wire? (c) What is the total current in the wire? (d) What is the drift speed of the conduction electrons? (e) What potential difference must exist between the ends of a 1.70 m length of the wire to produce the states electric field?
A 4.5×10−4 V/m electric field creates a 2.0×1017 electrons/s current in a 1.6-mm-diameter aluminum wire. What is the drift speed? What is the mean time between collisions for electrons in this wire?
A heating element is made by maintaining a potential difference of 75.0 V across the length of a Nichrome wire that has a 2.60 x 10-6 m2 cross section. Nichrome has a resistivity of 5.00 x 10-7 Ω·m. (I) If the element dissipates 5000 W, what is its length?(II) If a potential difference of 100 V is used to obtain the same dissipation rate, whatshould the length be?
A 50.0-g sample of a conducting material is all that is available. The resistivity of the material is measured to be 11 × 10-8 Ω · m, and the density is 7.86 g/cm3. The material is to be shaped into a solid cylindrical wire that has a total resistance of 1.5 Ω. (a) What length of wire is required? (b) What must be the diameter of the wire?
An aluminum wire with a diameter of 0.100 mm has a uniform electric field of 0.200 V/m imposed along its entire length. The temperature of the wire is 50.0°C. Assume one free electron per atom. (a) Use the informa- tion in Table 27.2 and determine the resistivity. (b) What is the current density in the wire? (c) What is the total current in the wire? (d) What is the drift speed of the conduction electrons? (e) What potential difference must exist between the ends of a 2.00-m length of the wire to produce the stated electric field?
The table given below shows the resistivity of three Material X, Y and Z? Samples X Y Z Resistivity 3 X 10-9 11.1 X 0-6 18X10-17 a. Arrange the samples in increasing order of conductivityb. Which of these is best conductor?c. Which are these is best insulator?
2. Suppose your phone's battery has a capacity of 2900 mAh and a potential difference of 3.8 V. What is the amount of charge, in C (coulombs), that is stored in your smartphone battery when it's fully charged?Charge = _____ C 3. Smartphone chargers are usually labeled with their current output in A (amps). Suppose your charger delivers a current of 1.1 A. If your phone's battery is completely drained, how long will it take to fully charge the battery using your charger?Charging time = _____ hours 4. Smartphones are advertised with a certain amount of "talk time", i.e., how long the phone's battery will last if you are making a call. If your phone is advertised with 24 hours of talk time, what is the average current coming from your phone's battery while making the call?Average current = _____ A 5. What is the average power output of your phone's battery while you're making a call?Average power = _____ W
6. What current flows through a 2.54–cm–diameter rod of pure silicon that is 23.0 cm long, when 1150 V is applied to it? (Such a rod may be used to make nuclear–particle detectors, for example.) This is not and will not be graded