Table 24.1 showed that the strength of the magnetic field 1 cm from a wire carrying a 10 A current is 4 times the earth’s field. Referring to Figure 24.20 for guidance, at what distance from the wire will the field equalthat of the earth?A. 2 cm B. 4 cm C. 8 cm D. 16 cm TABLE 24.1 Typical magnetic fieldstrengthsField source andlocationField strength (T)10 cm from a wire2 × 10-65 × 10-5with 1 A currentSurface of the earth1 cm from a wire2 × 1045 × 10-3with 10 A currentRefrigerator magnet100-turn coil, 1 cmdiameter, with1 A currentSurface of the sun,in a sunspot1 × 10-21 × 10-1Near a rare-earth1magnetMRI solenoid1World's strongestmagnet45 FIGURE 24.20 The strength of the magnetic field due to a long,current-carrying wire vs. distance from the wire.KEY CONCEPТSuppose that thefield has magnitude of fieldBo at a distance rɔfrom the wire.,Strength2Bo-ВоВоTwice as far••away, the field ishalf as strong.0+2ro3roroDistance from wire

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Answered: TABLE 24.1 Typical magnetic field…

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

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Table 24.1 showed that the strength of the magnetic field 1 cm from a wire carrying a 10 A current is 4 times the earth’s field. Referring to Figure 24.20 for guidance, at what distance from the wire will the field equal
that of the earth?
A. 2 cm B. 4 cm C. 8 cm D. 16 cm

TABLE 24.1 Typical magnetic field
strengths
Field source and
location
Field strength (T)
10 cm from a wire
2 × 10-6
5 × 10-5
with 1 A current
Surface of the earth
1 cm from a wire
2 × 104
5 × 10-3
with 10 A current
Refrigerator magnet
100-turn coil, 1 cm
diameter, with
1 A current
Surface of the sun,
in a sunspot
1 × 10-2
1 × 10-1
Near a rare-earth
1
magnet
MRI solenoid
1
World's strongest
magnet
45

FIGURE 24.20 The strength of the magnetic field due to a long,
current-carrying wire vs. distance from the wire.
KEY CONCEPТ
Suppose that the
field has magnitude of field
Bo at a distance rɔ
from the wire.,
Strength
2Bo-
Во
Во
Twice as far
••away, the field is
half as strong.
0+
2ro
3ro
ro
Distance from wire

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