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Chapter 23: Q4CQ (page 857)

Is an emf induced in the coil in Figure 23.54 when it is stretched? If so, state why and give the direction of the induced current.

Short Answer

Expert verified

The current will flow in an anticlockwise direction.

Step by step solution

01

Definition of induced current

The induced current is the current that is induced in a conducting loop that is exposed to a changing magnetic field.

02

Explanation

The right-hand rule is a well-known mnemonic in mathematics and physics for remembering the orientation of axes in three-dimensional space. A cross product of two vectors can be quickly determined using this method as well.

The surface area of the coil is reduced when the coil is stretched as shown in the figure. This reduces the amount of flux through the surface, resulting in induced emf through the coil.

A decreasing surface area indicates that the magnetic field in the direction of the paper's exit is losing coupling with the surface. As a result, the current will be such that it produces a magnetic field in the direction of the paper's exit. As a result, the current will flow in an anticlockwise direction.

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Most popular questions from this chapter

Suppose a motor connected to a 120 V source draws 10.0 A when it first starts. (a) What is its resistance? (b) What current does it draw at its normal operating speed when it develops a 100 V back emf?

Approximately how does the emf induced in the loop in Figure 23.57(b) depend on the distance of the center of the loop from the wire?

Suppose you have a supply of inductors ranging from 1.00 nHto 10.0 H, and capacitors ranging from 0.100 pFto 0.100 F. What is the range of resonant frequencies that can be achieved from combinations of a single inductor and a single capacitor?

How do the multiple-loop coils and iron ring in the version of Faraday’s apparatus shown in Figure 23.3 enhance the observation of induced emf?

An RLC series circuit has a200Ωresistor and a 25.0mHinductor. At 8000Hz, the phase angle is 45.0∘. (a) What is the impedance? (b) Find the circuit's capacitance. (c) IfVrms=408Vis applied, what is the average power supplied?
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