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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

An FM radio station broadcasts at a frequency of 100 MHz. What inductance should be paired with a 10 pF capacitor to build a receiver circuit for this station?

I A 20-cm-long, zero-resistance slide wire moves outward, on zero-resistance rails, at a steady speed of 10m/sin a 0.10Tmagnetic field. (See Figure 30.26.) On the opposite side, a 1.0惟carbon resistor completes the circuit by connecting the two rails. The mass of the resistor is 50mg.

a. What is the induced current in the circuit?

b. How much force is needed to pull the wire at this speed?

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a. What is the current through the battery immediately after the switch is closed?

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b. What is the current in the loop at t=5.0渭s? Assume that

only the circuit wire next to the loop is close enough to produce a significant magnetic field.
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