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Chapter 27: Q. 18 (page 762)
18. The electric field in a square aluminum wire is . What is the current in the wire?
The current in the wire is .
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72. You've decided to protect your house by placing a -m-tall iron lightning rod next to the house. The top is sharpened to a point and the bottom is in good contact with the ground. From your research, you've learned that lightning bolts can carry up to of current and last up to .
a. How much charge is delivered by a lightning bolt with these parameters?
b. You don't want the potential difference between the top and bottom of the lightning rod to exceed . What minimum diameter must the rod have?.
The current in asquare aluminum wire is . What are (a) the current density and (b) the electron drift speed?
The electron drift speed in a wire is exceedingly slow-typically only a fraction of a millimeter per second. Yet when you turn on a flashlight switch, the light comes on almost instantly. Resolve this apparent paradox.
Both batteries in FIGURE Q27.7 are ideal and identical, and all lightbulbs are the same. Rank in order, from brightest to least bright, the brightness of bulbs a to Explain.
The femoral artery is the large artery that carries blood to the leg. What is the resistance of a long column of blood in a 1.0-cm-diameter femoral artery? The conductivity of blood isrole="math" localid="1649056084708"
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