Two new materials have been discovered. One is shiny and has a metallic look, while the other is dull and has a non-metallic look. Although you think that one is a conductor and the other an insulator, you want to be certain. Describe a test you could do to test the conductivity of these two materials.

Two new materials have been discovered. One is shiny and has a metallic look, while the other is dull and has a non-metallic look. Although you think that one is a conductor and the other an insulator, you want to be certain. Describe a test you could do to test the conductivity of these two materials.

Glencoe Physics: Principles and Problems, Student Edition

1st Edition

ISBN:9780078807213

Author:Paul W. Zitzewitz

Publisher:Paul W. Zitzewitz

Chapter20: Static Electricity

Section: Chapter Questions

Problem 26A

See similar textbooks

Similar questions

6.31 A spherical shell has inner and outer radii a and b, respectively. Assume that the shell has a uniform conductivity o and that it has copper electrodes plated on the inner and outer surfaces. Show that %3D 477O a
Using hand-drawn schematic diagrams, show curves that illustrate the temperature dependence of the electrical resistivity for the following types of materials: metals, semiconductors, and superconductors. Carefully diagram each curve, and labelling the plot axes.
Question-5. A semiconductor has an electrical conductivity of 20 (N-m)', whereas the electron and hole mobilities are 0.04 and 0.03 m2/V-s, respectively. The density of the semiconductor is 4.62 g/cm³. The electrical charge of an electron (e) is 1.6 ×10-19 C. The atomic weight of the semiconductor is 59.72 g/mol. Avogadro constant (NA) is 6.023 × 1023 atoms/mol. (a) Compute the intrinsic carrier concentration for the semiconductor at room temperature (25 °C). (b) Compute the number of free electrons per atom for the intrinsic semiconductor at room temperature.
3) a) A wire sample (1 mm in diameter by 1 m in length) of an aluminum alloy (containing 1.2% Mn) is placed in an electrical circuit such as that shown in the figure below. A voltage drop of 432 mV is measured across the length of the wire as it carries a 10 A current. Calculate the electrical conductivity of this alloy - Length, I Area, A Sample geometry b) Copper has an electrical conductivity of 58.00 × 10° S/m and a free electron density of 104 x 10"m³. Calculate the drift velocity of these electrons under an electric field of 0.5 V/m.
P-type semi conducting material is Select one: a. holes are majority charge carriers and it is due to addition of trivalent impurities. O b. electrons are majority charge carriers and it is due to addition of trivalent impurities. O c. holes are minority charge carriers and it is due to addition of pentavalent impurities. Od. electrons are majority charge carriers and it is due to addition of pentavalent impurities.
1) a) A wire sample (1 mm in diameter by 1 m in length) of an aluminum alloy (containing 1.2% Mn) is placed in an electrical circuit such as that shown in the figure below. A voltage drop of 432 mV is measured across the length of the wire as it camies a 10 A current. Calculate the electrical conductivity of this alloy -Length, / Area, A Sample geometry b) Copper has an electrical conductivity of 58.00 x 106 S/m and a free electron density of 104 x 10²7m²³. Calculate the drift velocity of these electrons under an electric field of 0.5 V/m.
Is it feasible to describe the distinction between a conductor and an insulator using a semiconductor as an example? Why not use a graph to explain the arguments you're making?
Question 1 a) Ina closed circuit, an electric current of intensity i goes through a resistor of resistance R. The electric potential at the edges of R is measured to be V. If now we write R would this generally bethe definition ofthe resistance quantity R, or the expression of Ohm's Law? Explain. b) We define the resistivity (via the familiar notation) as E p= Thus show that the resistance R can be written as, R =p- here Lis the length ofthe resistor, and A is the cross-sectional area ofit. c) Let J the curent density (i/A). Express J in tems of the electron density n (electrons/m), the electron drift velocity va, and the electron charge e. d) Show that the resistivity can be expressed (via the familiar notation) as, m p= ne't here m is the electronmass; t is the period of time that elapses between two subsequent collisions, the electron undergoes with copper nuclei throughout its chaotic motion in the body of copper (supposing that the current carrying cable is made of copper). Hint:…
The molar conductivity of Na1 ions in aqueous solution at 25°C has been determined to be =.01 × 10-2 (V cm)-1 mol-1L. Assume an electric field of 1.0 × 102 V cm-1 is applied to the solution. Calculate the mobility and the drift velocity of Na1 ions.
Conduc-Thor-s. Thor has two square prism conductors that are made of the same ohmic material and with properties indicated below. Conductor Length | Cross-Section Side Length Alpha L Beta L/2 s/4 Suppose both conductors are subject to the same potential difference AV across their length while keeping their temperatures fixed. Which of the following is the correct relation between the electric currents, Ia and IB, through Alpha and Beta? O A. Ia = 8IB O B. 8Ia = Ig O. Ia = 4I8 O D. 4Ig = Ig Clear my choice
Using the mathematical expression for the conductivity of a material, explain how it varies with temperature for (i) semiconductors, (ii) good conductors.
The total number of free electrons is more, the conductivity of the material will be more. Select one: True v False