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Chapter 30: Q. 9 (page 869)

There is a cw induced current in the conducting loop shown in FIGURE EX30.9. Is the magnetic field inside the loop increasing in strength, decreasing in strength, or steady?

Short Answer

Expert verified

The magnetic field within the loop is dwindling.

Step by step solution

01

 Step1: Lenz's law is defined as follows:

Lenz's law, named after Emil Lenz, is based on the principle of conservation of energy and Newton's third law. It is the most fundamental method for determining the direction of the induced current. It claims that the direction of the induced current is always such that it opposes the change in the circuit or magnetic field that causes it.

02

 Step2:Applying magnetic field

The induced magnetic field is directed toward the page because the induced current is CW. The applied magnetic field is being absorbed by the page. As a result, when the induced magnetic field is directed in the same direction as the applied magnetic field, the magnetic flux and thus the magnetic field strength decrease.

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Most popular questions from this chapter

The metal wire in FIGURE moves with speed vparallel to a straight wire that is carrying current I. The distance between the two wires isd. Find an expression for the potential difference between the two ends of the moving wire.


An 8.0cm脳8.0cmsquare loop is halfway into a magnetic CALC field perpendicular to the plane of the loop. The loop's mass is and its resistance is 0.010惟. A switch is closed at t=0s, causing the magnetic field to increase from0to1.0Tin0.010s .

a. What is the induced current in the square loop?

b. With what speed is the loop "kicked" away from the magnetic field?

Hint: What is the impulse on the loop?

56. II Your camping buddy has an idea for a light to go inside your CALC tent. He happens to have a powerful (and heavy!) horseshoe magnet that he bought at a surplus store. This magnet creates a0.20T field between two pole tips 10cmapart. His idea is to build the hand-cranked generator shown in FIGURE P30.56. He thinks you can make enough current to fully light a1.0惟lightbulb rated at 4.0W. That's not super bright, but it should be plenty of light for routine activities in the tent.

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73. II For your final exam in electronics, you're asked to build an LC circuit that oscillates at 10kHz. In addition, the maximum current must be 0.10Aand the maximum energy stored in the capacitor must be 1.0脳10鈭�5J. What values of inductance and capacitance must you use?

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a. After the switch has been closed for a long time, what is the current in the circuit? Call this current I0.

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