
1) The density of free electrons in gold is 5.90 x 1028 m-3. The resistivity of...
The resistivity of gold is 2.44 x 10-8 ohms.m at room temperature. A gold wire that is 0.9 mm in diameter and 14 cm long carries a current of 940 mA. What is the electric field in the wire? Answer 0.090 V/m 0.028 V/m 0.046 V/m 0.0090 V/m 0.036 V/m
2) The number density of conduction electrons in silver is 5.86 x 1028 m-3. independent of temperature. If a cylindrical wire of length L and cross-sectional area A were made of silver its electrical resistance would be given by R= ρ L A where ρ is the resistivity of the material measured in Ω−m. The resistivity can also be shown to be related to microscopic properties of the metal such as the number density of conduction electrons, the mass and...
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3. The resistivity of gold is 2.44 x10^-8 ohm.m at room temperature. A gold wire that is 0.9 mm in diameter and 14 cm long carries a current of 940 mA. What is the electric field in the wire9 A) 0.036 V/m B) 0.0090 V/m C) 0.028 V/m D) 0.046 V/m E) 0.090 V/m
The resistivity of gold is 2.44 x 10-80 mat a temperature of 20°C. A gold wire, 1.8 mm in diameter and 14 cm long, has a current of 480 mA flowing through it. What is the power converted in this wire at 20°C? 0.19 mW O 0.14 mW 0.077 mW 0.25 mW O 0.31 mW
Problem 3 Copper has 8.5-1028 free electrons per cubic meter. A 71.0 cm length of 12-gauge copper wire that is 2.05 mm in diameter carries 4.85 A of current. (a) How much time does it take for an electron to travel the length of the wire? (b) Repeat part (a) for 6-gauge copper wire (diameter 4.12 mm) of the same length that carries the same current. (c) More generally, how does changing the diameter of the wire that carries a...
7) A 4.0 m length of gold wire is connected to a 1.5 V battery, and a current of 4.0 mA flows through it. What is the diameter of the wire? (The resistivity of gold is 2.44 × 10-8 Ω·m.) A) 17 µm B) 8.5 µm C) 48 µm D) 9.0 µm
(16 points) Copper has 8.5 x 1023 free electrons per cubic meter. A segment of copper wire that has a length of 45 cm and cross-sectional radius of 1.1 mm carries a current of 4.8 A. (a) Calculate the drift velocity of electrons in the wire. 9. (b) Calculate the average time i tkes for an electron to dfift through the wire segment. (Area of a circle A m2, where r is the radius)
A 5.30 m length of 1.6 mm -diameter wire carries a 710 mA current when 18.0 mV is applied to its ends. The drift velocity is 1.2×10−5 m/s . Part A Determine the resistance R of the wire. Part B Determine the resistivity ρ. Part C Determine the current density j. Part D Determine the electric field inside the wire. Part E Determine the number n of free electrons per unit volume.
You have a piece of copper wire of length L = 15.0 cm and radius R = 0.5 mm. Given that the resistivity of copper is 1.68 X 10^-8 Ohm*m, what is: a. The resistance of your piece of wire? b. If a current of i = 0.5 mA is set up in the wire, what is the magnitude of the current density of the wire? c. With a current of i = 0.5 mA, what is the change in...
13. The resistivity of aluminum at 25 'C has been measured to be 2.72 x 10-8 0 m. The thermal coefficient of resistivity of aluminum at 0 C is 4.29 x 10-3 K-1. Aluminum has a valency of 3, a density of 2.70 g cm3, and an atomic mass of 27 a. Calculate the resistivity of aluminum at-40°С. (Ans: 2.03 x 103 Ω m) b. What is the thermal coefficient of resistivity at-40'C? (Ans: 5.23x 103K c. Estimate the mean...