Physics for Scientists and Engineers
6th Edition
ISBN: 9781429281843
Author: Tipler
Publisher: MAC HIGHER
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Chapter 25, Problem 31P
To determine
The drift speed of free electrons.
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A gold wire of 0.500 mm diameter has 8.50 × 1028 conduction electrons per cubic meter. If the drift speed is 4.30 μm/s, what is the current in the wire?
A current of 0.87 A flows through a copper wire of radius 3.53 mm; copper has 8.50x1028 free electrons per cubic meter. What is the drift speed of an electron in the wire? (Express your answer in (m/s) to three significant figures)
A conductor has a cross-sectional area of 2.3x106m² and the number of free electrons per unit volume is 8.5 x1028 electron/m. When the current is 14.5 A, find the drift speed (in mm/s) of the electrons. Use the charge of the electron to be 1.6x1019 C.
Chapter 25 Solutions
Physics for Scientists and Engineers
Ch. 25 - Prob. 1PCh. 25 - Prob. 2PCh. 25 - Prob. 3PCh. 25 - Prob. 4PCh. 25 - Prob. 5PCh. 25 - Prob. 6PCh. 25 - Prob. 7PCh. 25 - Prob. 8PCh. 25 - Prob. 9PCh. 25 - Prob. 10P
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- A 10-gauge copper wire has a cross-sectional area A=5.26mm2 and carries a current of I=5.00A . The adensity of copper is =89.50g/cm2 . One mole ofcopper atoms (6.021023atoms) has a mass ofapproximately 63.50 g. What is the magnitude of the drift velocity of the elections, assuming that each copper atom contributes one free electron to the current?arrow_forwardAn electronic device designed to operate at any temperature in the range from 10.0C to 55.0C contains pure carbon resistors. By what factor does their resistance increase over this range?arrow_forwardConsider a power plant is located 60 km away from a residential area uses Q-gauge (A=42.40mm2) wire ofcopper to transmit power at a current of I = 100.00 A.How much more power is dissipated in the copper wires than it would be in superconducting wires?arrow_forward
- What current flows through a 2.54-cm-diameter rod of Pure silicon that is 20.0 cm long, when 1.00103 V is applied to it? (Such a rod may be used to make nuclear- particle detectors, for example.)arrow_forwardA current of 5 A exists in a copper wire of length 50 m and diameter of 2.5 mm when applying apotential difference of 0.86 V. Assuming the current is uniform, calculate(a) the current density(b) electron drift speed.(c) the copper conductivityarrow_forwardAt what temperature will aluminum have a resistivity that is three times the resistivity of copper at room temperature?arrow_forward
- A small but measurable current of 9.87×10-9 A exists in a copper wire whose diameter is 0.650 mm. The electron drift speed is 4.32×10-14 m/s. Calculate the number of charge carriers per unit volume.arrow_forwardA small but measurable current of 1.2 * 10-10 A exists in a copper wire whose diameter is 2.5 mm.The number of charge carriers per unit volume is 8.49 * 10^28 m-3. Assuming the current is uniform, calculate the (a) current density and (b) electron drift speed.arrow_forwardWhat would happen to the temperature and the resistivity value of a wire if the current were very large?arrow_forward
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