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Chapter 4: Q3DQ (page 840)
A cylindrical rod has resistivity . If we triple its length and diameter, what is its resistivity in terms ofrole="math" localid="1655715631515" .
Resistivity remains constant.
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Lightning Strikes. During lightning strikes from a cloud to the
ground, currents as high as 25,000 A can occur and last for about 40 ms.
How much charge is transferred from the cloud to the earth during such a
strike?
The text states that good thermal conductors are also good electrical conductors. If so, why don’t the cords used to connect toasters, irons, and similar heat-producing appliances get hot by conduction of heat from the heating element?
Each of the lettered points at the corners of the cube in Fig. Q27.12 represents a positive charge moving with a velocity of magnitude in the direction indicated. The region in the figure is in a uniform magnetic field , parallel to the x-axis and directed toward the right. Which charges experience a force due to ? What is the direction of the force on each charge?
Batteries are always labeled with their emf; for instances an AA flashlight battery is labelled “ 1.5 V ”. Would it also be appropriate to put a label on batteries starting how much current they provide? Why or why not?
Ordinary household electric lines in North America usually operate at 120 V . Why is this a desirable voltage, rather than a value considerably larger or smaller? On the other hand, automobiles usually have 12 V electrical systems. Why is this a desirable voltage?
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