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Chapter 27: Q.22 (page 762)
22. A -mm-diameter wire carries a current when the electric field is . What is the wire's resistivity?
The wire's resistivity is .
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In an integrated circuit, the current density in a wide gold film is localid="1648893767234" . How much charge flows through the film in ?
Household wiring often uses diameter copper wires. The wires can get rather long as they snake through the walls from the fuse box to the farthest corners of your house. What is the potential difference across a long, diameter copper wire carrying an current?
A-cm-long hollow nichrome tube of inner diameter , outer diameteris connected, at its ends, to a battery. What is the current in the tube?
5. The electron drift speed is in a metal with a mean time between collisions of . What is the electric field strength?
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?.
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