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Chapter 30: Q. 13 (page 869)
13. Rank in order, from largest to smallest, the three time constants to for the three circuits in FIGURE Q30.13. Explain.
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You want to insert a loop of copper wire between the two permanent magnets in FIGURE Q30.2. Is there an attractive magnetic force that tends to pull the loop in, like a magnet pulls on a paper clip? Or do you need to push the loop in against a repulsive force? Explain
71. II An LC circuit is built with ainductor and an capacitor. The capacitor voltage has its maximum value ofat .
a. How long is it until the capacitor is first fully discharged?
b. What is the inductor current at that time?
A circular loop made from a flexible, conducting wire is shrinking. Its radius as a function of time is . The loop is perpendicular to a steady, uniform magnetic field . Find an expression for the induced emf in the loop at time .
How much energy is stored in a 3.0-cm-diameter, 12-cm-long solenoid that has 200 turns of wire and carries a current of 0.80 A?
A bar magnet is pushed toward a loop of wire as shown in FIGURE Q30.7. Is there a current in the loop? If so, in which direction? If not, why not?
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