Chapter 4: Q13DQ (page 947)
In the circuit figure when switch S is suddenly closed, the wire L is pulled toward the lower wire carrying current I. Which (a or b) is the positive terminal of the battery? How do you know?
The current flow from right to left that’s why pointis positive terminal of the battery.
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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?
Two copper wires with different diameter are joined end to end. If a current flow in the wire combination, what happens to electrons when they move from the large diameter wire into the smaller diameter wire? Does their drift speed increase, decrease, or stay the same? If the drift speed change, what is the role the force that causes the change? Explain your reasoning.
A cylindrical rod has resistivity . If we triple its length and diameter, what is its resistivity in terms ofrole="math" localid="1655715631515" .
An 18-gauge copper wire (diameter 1.02 mm) carries a current
with a current density of . The density of free electrons for
copper iselectrons per cubic meter. Calculate (a) the current in
the wire and (b) the drift velocity of electrons in the wire.
In the circuit shown in Fig. E26.18,(a) What is the potential difference Vab between points a and b when the switch S is open and when S is closed? (b) For each resistor, calculate the current through the resistor with S open and with S closed. For each resistor, does the current increase or decrease when S is closed?
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