DATA TABLES
:
Part I
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29 - 4

Current in solenoid
I
Magnetic field
B
(A)
(mT)
0.0
0.000
0.2
0.031
0.4
0.065
0.6
0.099
0.8
0.136
1.00
0.169
1.20
0.203
1.40
0.235
1.60
0.264
1.80
0.296
2.00
0.333
2.20
0.366
Length of solenoid (m)
1 m
Number of turns
199
Turns/m (m
–1
)
199
Part II
Length of solenoid
Turns/meter
n
Magnetic field
B
(m)
(m
–1
)
(mT)
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29 - 5

The Magnetic Field in a Slinky
2
97.50
0.193
1.8
108.33
0.217
1.6
121.88
0.258
1.4
139.29
0.297
1.2
162.50
0.395
1.0
195.00
0.498
0.8
243.75
0.625
Number of turns in Slinky
195
ANALYSIS:
1.
On Page 2 of the experiment file, plot a graph of magnetic field
B
vs
. the
current
I
through the solenoid.
(Graph)
2.How is magnetic field related to the current through the solenoid?
3.Determine the equation of the best-fit line, including the y-intercept. Note the constants and their units.
4.For each of the measurements of Part II, calculate the number of turns per meter. Enter these values in the data table. (Table)5.On Page 3 of the experiment file, plot a graph of magnetic field Bvs.the turns per meter of the solenoid (n). (Graph)6.How is magnetic field related to the turns/meter of the solenoid?
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7.Determine the equation of the best-fit line to your graph. Note the constants
8. From Ampere’s law, it can be shown that the magnetic field Binside a long solenoid isBnI0where 0 isthepermeability constant. Do your results agree with this equation? Explain.
9. Assuming the equation in the previous question applies for your solenoid, calculate the value of 0using your graph of B vs. n
.
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10. Look up the value of 0,thepermeability constant. Compare it to your experimental value.
11. Was your Slinky positioned along an east-west, north-south, or on some otheraxis? Will this have any effect on your readings?
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The Magnetic Field in a Slinky
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