1. Magnetism
r1.04

2. Introduction The Snapshot button is used to capture the screen.
Magnetism
Introduction
Each page of this lab that contains the symbol
should be inserted into your journal. After completing a lab page with the snapshot symbol, tap (in the upper right corner) to insert the page into your journal.
Journals and Snapshots
The Snapshot button is used to capture the screen.
The Journal is where snapshots are stored and viewed.
The Share button is used to export or print your journal to turn in your work.
Note: You may want to take a
snapshot of the first page of
this lab as a cover page for
your journal.

3. Magnetism
Lab Challenge
Investigate the strength of a magnetic field from a permanent magnet as a function of distance.

4. Magnetism
Background
The strength of a magnetic field varies with distance from a magnet. The strength of a magnetic field could vary inversely as the square of the distance, similar to the strengths of gravitational and electric fields...

5. Magnetism
...Background
... or, the strength of a magnetic field could vary in a different way relative to distance. Unlike gravitational fields that are radial, a magnetic field consists of complete loops that surround and go through the magnet.

6. Materials and Equipment
Magnetism
Materials and Equipment
Collect all of these materials before beginning the lab.
Magnetic field sensor
PASPORT extension cable
Neodymium Magnet (1/2 or 3/4")
Meter stick

7. Sequencing Challenge Magnetism
The steps to the left are part of the procedure for this lab activity. They are not in the right order. Determine the correct sequence of the steps, then take a snapshot of this page.
A. Place a magnet next to the 5 cm mark on the meter stick with the north pole of the magnet facing the sensor.
B. Place the magnetic field sensor so the end of the rod is even with the zero end of the meter stick.
C. Proceed to data recording and manual sampling for every 1 cm increase in the magnet's position up to 15 cm.
D. Place a meter stick on a flat surface.
L6-Text Box
[The correct sequence of steps is…]

8. Setup Set the meter stick flat on a lab table.
Magnetism
Setup
Set the meter stick flat on a lab table.
Connect the magnetic field sensor to the SPARK Science Learning System using the PASPORT extension cable.
Set the magnetic field sensor on the lab table so that the tip of the sensor meets the 0 cm marker on the meter stick.

9. Magnetism
Setup
Hold the magnet far away from the magnetic field sensor, then press the Tare button on the sensor.
Note: If your sensor does not have a Tare button, proceed to the next step.
Set the magnet on the lab bench against the meter stick, with either flat face pointed towards the tip of the magnetic field sensor.
Slide the magnet up the meter stick until it is aligned with the 5 cm marker on the meter stick (5 cm away from the tip of the sensor).

10. Magnetism
Collect Data
Q1: Why do you think it is important to have the tip of the magnetic field sensor pointed at the middle of the magnet, rather than off axis?
L6-Text Box
[It is important to have the sensor and magnet aligned because…]

11. Magnetism
Collect Data
On the next page is a table with one column already populated with data. This data represents the different distances between the magnet and sensor at which you will measure the field strength.
Be sure that the actual distance between the magnet and sensor matches what is specified in the table before recording each data point.
This number should match the actual distance between your magnet and the sensor.
Note: If your magnetic field measurements are negative, turn the magnet around such that the North end is pointing towards the sensor.

12. Collect Data Magnetism Tap to begin data collection.
Set the distance between the sensor and the magnet to match what is specified in the table.
Tap to record the magnetic field strength at that distance.
Move the magnet to the next distance specified in the table and repeat the previous step until you have reached 15 cm.
L1,2,4,5-Table
Col[The best choice is…]

13. Collect Data Tap to stop data collection
Magnetism
Collect Data
Tap to stop data collection
Q2: The magnetic field sensor measures the axial field strength component from the magnet. What do you think the magnitude of the radial (perpendicular) field strength component would be without actually measuring it?
L6-Text Box
[The radical field strength would be…]
Radial
Axial
Radial (perpendicular)

14. Magnetism
Prediction
Draw a prediction of how you think your magnetic field strength versus distance data would look in a graph.
*To Draw a Prediction:
1. Tap to open the tool palette.
2. Tap then use your finger to draw your prediction.
3. Tap when finished.
4. If you make a mistake, tap
to clear your prediction.

15. Magnetism
Analysis
How does the actual graph compare to your prediction on the previous page? Is this what you predicted?
L6-Text Box
[The prediction was…]

16. Magnetism
Analysis
From the graph, what do you conclude is the mathematical relationship between the magnetic field strength and distance?
L6-Text Box
[The mathematical relationship may be…]

17. Analysis Magnetism Apply a "Power" curve fit to your data.
Note: The form of the curve fit will be y=Axn+B (n can be negative)
*To Apply a Curve Fit:
1. Tap to open the tool palette.
2. Tap to open the Curve Fit screen.
3. Tap the name of the curve fit required.

18. Magnetism
Analysis
How well did your curve fit match your data? Was the mathematical relationship you chose representative of the theoretical relationship? If not, what do you think the real relationship is?
L4,5,6-Text Box
[The curve fit was…]
[I/We think the real mathematical relationship may be…]

19. Magnetism
Synthesis
The needle in a compass acts like a tiny bar magnet. When the needle is in the presence of a strong magnetic field, it will align itself with that field. If the red end of the needle represents the south pole of the "magnet," which direction would the red end point if the compass were placed between the poles of this magnet?
To the left, or
to the right?
L6-Text Box
[The red end of the needle would point…]

20. Magnetism
Synthesis
If you had two identical magnets separated by distance d with the north pole of each magnet facing the other, what value would your magnetic field sensor read at distance d/2?
L6-Text Box
[The magnetic field sensor would read…] d

21. Magnetism
Synthesis
If each magnet alone produces an axial magnetic field strength of 0.25 T at a distance d/2, what value would your magnetic field sensor read at a distance d/2 if the north and south poles were facing each other a distance d apart?
L6-Text Box
[The magnetic field sensor would read…] d

22. Magnetism
Synthesis
How will the magnetic field strength measured half way between the magnets change (increase, decrease, or stay the same) if the distance between the magnets is increased from d to 10d?
L6-Text Box
[The magnetic field strength would…]
10d

23. Multiple Choice Question
Magnetism
Multiple Choice Question
A compass is positioned at a location near the north pole of a bar magnet and moved around the magnet toward the south pole. How does the compass needle orient itself at the south pole?
The compass orientation does not change
Not enough information
Points towards the south pole
Points outward from the south pole
L6-Text Box
[The best choice is…]

24. Multiple Choice Question
Magnetism
Multiple Choice Question
As the magnitude of the magnetic field from a permanent (disc) magnet increases, the position of the sensor from the magnet will:
increase
decrease
remain the same
decrease to zero
L6-Text Box
[The best choice is…]

25. Magnetism
Congratulations!
You have completed the lab.
Please remember to follow your teacher's instructions for cleaning-up and submitting your lab.
Color scheme (RGB values)
biology 121, 173, 54
chemistry 0 176, 216
physics 0, 102, 204
earth 204, 102, 0
middle 153, 102, 153
elementary 255, 51, 0

26. Magnetism
References
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