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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A silver wire 2.6 mm in diameter transfers a charge of 420 C in 80
min. Silver containsfree electrons per cubic meter. (a) What is the
current in the wire? (b) What is the magnitude of thedrift velocity of the
electrons in the wire?
A battery-powered global positioning system (GPS) receiver operating 9.0 V on draws a current of 0.13 A. How much electrical energy does it consume during 30 minutes?
Why does an electric light bulb nearly always burn out just as you turn on the light, almost never while the light is shining?
Electrons in an electric circuit pass through a resistor. The wire on either side of the resistor has the same diameter.(a) How does the drift speed of the electrons before entering the resistor compare to the speed after leaving the resistor? (b) How does the potential energy for an electron before entering the resistor compare to the potential energy after leaving the resistor? Explain your reasoning.
Question: A high voltage dc power line falls on a car, so the entire metal body of the car is at a potential of with respect to the ground. What happens to the occupants (a) when they are sitting in the car and (b) when they step out of the car? Explain your reasoning.
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