Physics for Scientists and Engineers, Vol. 1
6th Edition
ISBN: 9781429201322
Author: Paul A. Tipler, Gene Mosca
Publisher: Macmillan Higher Education
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Chapter 25, Problem 4P
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Lightning is a spectacular example of electric current in a natural phenomenon. There is much variability to lightning bolts, but a typical event can transfer 10^9 J of energy across a potential difference of perhaps 5 x 10^7 V during a time interval of about 0.2 s. Use this information to estimate
(a) the total amount of charge transferred between cloud and ground
(b) the current in the lightning bolt
(c) the average power delivered over the 0.2 s.
Three wires meet at a junction. Wire 1 has a current of 0.40 A into the junction. The current of wire 2 is 0.65 A out of the junction. (a) How many electrons per second move past a point in wire 3? (b) In which direction do the electrons move—into or out of the junction?
Suppose that there is a wire. It is made out of material that has a the following information:
temperature coefficient = 0.005/°C
cross sectional area = 4.51x10-6 m²
length: 1.00 m
free electron density = 8.49 x 1028 electrons/m³
The wire is at temperature 20°C and it carries a current of 5 A when connected to a 35 V battery.
Find the (1) drift speed of the electrons and (2) resistivity at 50°C.
Chapter 25 Solutions
Physics for Scientists and Engineers, Vol. 1
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