Macmillan Learning Two insulated copper wires of similar overall diameter have very different interiors. One wire possesses a solid core of copper, with a circular cross section of radius 3.03 mm. The other wire is composed of 19 strands of thin copper wire bundled together. Each strand has a circular cross section of radius 0.606 mm. The current density J in each wire is the same. J = 1350 A/m² How much current does each wire carry? solid wire current: A solid wire resistance: The resistivity of copper is p = 1.69 × 10-8 22.m. What is the resistance of a 1.75 m length of each wire? stranded wire current: Ω stranded wire resistance: A Ω

Macmillan Learning Two insulated copper wires of similar overall diameter have very different interiors. One wire possesses a solid core of copper, with a circular cross section of radius 3.03 mm. The other wire is composed of 19 strands of thin copper wire bundled together. Each strand has a circular cross section of radius 0.606 mm. The current density J in each wire is the same. J = 1350 A/m² How much current does each wire carry? solid wire current: A solid wire resistance: The resistivity of copper is p = 1.69 × 10-8 22.m. What is the resistance of a 1.75 m length of each wire? stranded wire current: Ω stranded wire resistance: A Ω

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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Current Attempt in Progress The magnitude J(r) of the current density in a certain cylindrical wire is given as a function of radial distance from the center of the wire's cross section as J(r) = Br, where r is in meters, J is in amperes per square meter, and B = 2.24 x 105 A/m3. This function applies out to the wire's radius of 2.00 mm. How much current is contained within the width of a thin ring concentric with the wire if the ring has a radial width of 11.5 um and is at a radial distance of 1.25 mm? Number i Units
Question A spool of copper wire 200 m long and with a diameter of 0.320 mm is at 20.0°C. For copper, the resistivity is 1.70 X 10-8 Q·m and the temperature coefficient of resistivity is 3.90 X 10-3 (°C)~1. (a) What is the magnitude of the electric field (in V/m) in the wire if it carries a current of 0.400 A? V/m (b) What is the electric power (in W) delivered to the spool while it carries a current of 0.400 A? W (c) What is the power (in W) delivered to the spool if the potential difference across the wire is held constant and the temperature is increased to 280°C? W
Part A A 1.60 m cylindrical rod of diameter 0.450 cm is connected to a power supply that maintains a constant potential difference of 12.0 V across its ends, while an ammeter measures the current through it. You observe that at room temperature (20.0° C) the ammeter reads 18.7 A. while at 92.0°C it reads 17.0 A. You can Find the resistivity for the material of the rod at 20.0° C. ignore any thermal expansion of the rod. Express your answer in ohm-meters. For related problemsolving tips and strategies, you may want to view a Video Tutor Solution of Temperature dependence of resistance. να ΑΣφ N. m Submit Previous Answers Request Answer X Incorrect; Try Again; 7 attempts remaining Part B Find the temperature coefficient of resistivity at 20.0°C for the material of the rod. Express your answer in reciprocal degrees Celsius to two significant figures. ? a = (°C) 1 Submit Previous Answers Request Answer X Incorrect; Try Again; 8 attempts remaining
An electron beam has a measured current of I = 54.30 µA with a radius of 2.00 mm. What is the magnitude of the current density (in A/m²) of the beam? A/m2 Additional Materials M eBook
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The starter motor of a car engine draws a current of 200 A from the battery. The copper wire to the motor is 4.80 mm in diameter and 1.2 m long. The starter motor runs for 0.610 s until the car engine starts. Part A How much charge passes through the starter motor? Express your answer with the appropriate units. Value Submit ▾ Part B HÅ Submit Value Units Request Answer How far does an electron travel along the wire while the starter motor is on? Express your answer with the appropriate units. μA BRE Units Request Answer ? ?
Imagine that we connect the terminals of a 1.5 V battery with a single wire 30 centimeters long. a) What is the electric field magnitude in the wire when dynamic equilibrium is established and why? b) Does this field strength depend on the wire's conductivity and/or its cross-sectional area? c) Does the total current flowing in the wire in these circumstances depend on the wire's conductivity and/or its cross-sectional area? Explain.
Subject: physics
A wire is 0.81 m long and 0.88 mm² in cross-sectional area. It carries a current of 5.5 A when a 2.6 V potential difference is applied between its ends. Calculate the conductivity of the material of which this wire is made. Number i Units
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A long, cylindrical wire with a length of 1.5 m and a cross-sectional area of 5.0 mm2 carries a steady current of 5.0 A. If the number density of free electron carriers in the wire is 8.0 x 1028 e- ' s/m3, what is the drift velocity of the free electrons that carry the current? a. 6.5 x 10-7 m/s b. 7.8 x 10-7 m/s c. 4.2 x 10-7 m/s d. 9.7 x 10-7 m/s e. 2.1 x 10-6 m/s