Chapter 19: Q27Q (page 796)
Should an ammeter have a low or high resistance? Why? Should a voltmeter have a low or high resistance? Why?
An ammeter should have low resistance since it is connected in series. A voltmeter should have high resistance since it is connected in parallel.
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How does the final (equilibrium) charge on the capacitor plates depend on the size of the capacitor plates? On the spacing between the capacitor plates? On the presence of a plastic slab between the plates?
A particular capacitor is initially charged. Then a high-resistance Nichrome wire is connected between the plates of the capacitor, as shown in Figure 19.69. The needle of a compass placed under the wire deflects to the east as soon as the connection is made. After the compass needle no longer deflects.
(a)Which of the diagrams in Figure 19.69 best indicates the electron current at three locations in this circuit? (1) after the circuit is connected, (2) after the circuit is connected, (3) after the circuit is connected.
(b)Which of the diagrams in Figure 19.70 best indicates the net electric field inside the wire at three locations in this circuit? (1) after the circuit is connected, (2) after the circuit is connected, (3) after the circuit is connected.
The capacitor in Figure 19.67 is initially uncharged, then the circuit is connected. Which graph in Figure 19.66 best describes the absolute value of the charge on the left plate as a function of time?
How is the charging time for a capacitor correlated with the initial current? That is, if the initial current is bigger, is the charging time, longer, shorter, or the same?
State whether the following statement is true or false, and briefly explain why: “In the two circuits shown in Figure 19.64, the battery output power is greater in circuit 2 because there is an additional resistor dissipating power.”
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