PHYS  iLab (O) Experiment 7
Subject: Physics    / General Physics
Magnetic Field of a Permanent Magnet and a Solenoid
Name: __________________ Date: ___________
2 questions @ 1 point each and 14 questions @ 2 points each. 30 points total.
*Note: There are 2 parts to this worksheet.
Part 1: Prediction
1. How does the magnitude of the magnetic field change as the distance from the magnet
changes? (1 point)
Part 1: Data
2. Record the equation of your fit and the scale factor here. (2 points)
Equation of Fit

Scale Factor

Power (n)

Y offset (B)

3. Paste a copy of your magnetic-field versus distance graph here. (2 points)
Part 1: Questions
4. Is the relationship between magnetic field strength and distance linear? (2 points)
5. Based on the results of the curve fit in the statistics area, what is the relationship between
the magnetic field strength and the distance from the magnet? (2 points)
6. Did your fit work for those data points that were closest to the magnet? Explain. (2 points)
Part 2: Prediction
7. How does the magnetic field in the center of a solenoid depend on the current through the
solenoid? (1 point)

Part 2: Data
8. Record the number of turns and the length of your solenoid in the table below. Calculate
the turns per length. (2 points)
PHYS320 iLab (O) Datasheet

Page 1

Experiment 7

Number of
loops of wire:
Length of
solenoid (m):
n turns per
9. Record the measured resistance of the solenoid here. (2 points)
10. Paste a copy of your magnetic-field versus time graph here. (2 points)
11. Record the average voltages and magnetic fields in the table below. Calculate the current
through the solenoid using Ohm’s law. Calculate the turns per length of the solenoid. Find
the average. (2 points)
Average voltage


Current (A)

Average Magnetic
Field (mT)


N/L (turns per m)

12. Calculate a percent difference for the two separate measurements of the turns per length
for your solenoid using the formula: (2 points)

( measurement 1?measurement 2 )
measurement 1

× 100

Show your work.
Part 2: Questions
13. What were the sources of error in this experiment? (2 points)
14. How does the strength of the magnetic field relate to the turn per length? (2 points)
15. How does the magnetic field strength relate to the current in the coil? (2 points)
16. What physical quantity does the measurement of the magnetic field at zero voltage
correspond to? (2 points)

PHYS320 iLab (O) Datasheet

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