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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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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FIGURE shows a bar magnet being pushed toward a conducting loop from below, along the axis of the loop.
a. What is the current direction in the loop? Explain.
b. Is there a magnetic force on the loop? If so, in which direction? Explain.
Hint: A current loop is a magnetic dipole.
c. Is there a force on the magnet? If so, in which direction?

Your camping buddy has an idea for a light to go inside your tent. He happens to have a powerful and heavy horseshoe magnet that he bought at a surplus store. This magnet creates a field between two pole tips apart. His idea is to build the hand-cranked generator shown in FIGURE .He thinks you can make enough current to fully light a lightbulb rated at . That’s not super bright, but it should be plenty of light for routine activities in the tent.
a. Find an expression for the induced current as a function of time if you turn the crank at frequency . Assume that the semicircle is at its highest point at .
b. With what frequency will you have to turn the crank for the maximum current to fully light the bulb? Is this feasible?

67. II FIGURE P30.67 shows the potential difference across a potential difference across a inductor. The current through the inductor at is . Draw a graph showing the current through the inductor from to

FIGURE shows a -cm-diameter loop with resistance around a -cm-diameter solenoid. The solenoid is cm long, has turns, and carries the current shown in the graph. A positive current is when seen from the left. Find the current in the loop at
The switch in FIGURE has been open for a long time. It is closed at .
a. What is the current through the battery immediately after the switch is closed
b. What is the current through the battery after the switch has been closed a long time
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