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<img src="https://live.staticflickr.com/65535/50402802917_99379651e6.jpg" width="1000" height="100" alt="Investigation Game Header">
We’re trying to figure out how the earth’s magnetic field helps animals navigate. To do this, we’re going to use what you already know about magnets to model the earth’s magnetic field.
Which of these objects is mostly likely to be moved by the earth’s magnetic field?
<center>
[[compass]]
<a data-passage="compass" class="link-internal link-image"><img src="https://live.staticflickr.com/65535/50380277396_538a967258.jpg" width="500" height="375" alt="compass"></a>
[[magnet]]
<a data-passage="magnet" class="link-internal link-image"><img src="https://live.staticflickr.com/65535/50380457372_8001565811.jpg" width="500" height="375" alt="bar magnet"></a>
[[paperclip]]
<a data-passage="paperclip" class="link-internal link-image"><img src="https://live.staticflickr.com/65535/50380457487_268e528f84.jpg" width="500" height="375" alt="paperclip"></a>
[[bacteria]]
<a data-passage="bacteria" class="link-internal link-image"><img src= "https://upload.wikimedia.org/wikipedia/commons/e/e5/Small_magnetosome.jpg" width="500" height="384" alt="Magnetoreception in bacteria"></a>
</center>
<img src="https://live.staticflickr.com/65535/50402802917_99379651e6.jpg" width="1000" height="100" alt="Investigation Game Header">
Yes! The needle in a compass turns to align with the earth's magnetic field because it is magnetic.
<img src="https://live.staticflickr.com/65535/50380277396_538a967258.jpg" width="500" height="375" alt="compass">
A compass needle can also be moved by the magnetic field of a magnet.
If we bring this compass towards the magnet, what will happen?
It will [[point towards the north]] pole of the magnet.
It will [[point towards the south]] pole of the magnet.
It [[won't move]] because the magnetic field of the earth is too strong.
<img src="https://live.staticflickr.com/65535/50402802917_99379651e6.jpg" width="1000" height="100" alt="Investigation Game Header">
A magnet like this has a magnetic field, but it's too heavy to be moved by the earth's magnetic field.
<img src="https://live.staticflickr.com/65535/50380457372_8001565811.jpg" width="500" height="375" alt="bar magnet">
Choose something else
[[compass]]
[[paperclip]]
[[bacteria]] <img src="https://live.staticflickr.com/65535/50402802917_99379651e6.jpg" width="1000" height="100" alt="Investigation Game Header">
A paperclip can be magnetic, but it doesn't turn to align with the magnetic field when you put it down on a table.
<img src="https://live.staticflickr.com/65535/50380457487_268e528f84.jpg" width="500" height="375" alt="paperclip">
What does turn to match the earth's magnetic field?
[[compass]]
[[magnet]]
[[bacteria]] <img src="https://live.staticflickr.com/65535/50402802917_99379651e6.jpg" width="1000" height="100" alt="Investigation Game Header">
Some bacteria have tiny pieces of magnetite within their cells. The magnetite can line up to form a string of magnetite beads. The beads line up with the magnetic field of the earth and show the bacteria which way is up and down when they are floating in the water.
<center>
<img src="https://upload.wikimedia.org/wikipedia/commons/e/e5/Small_magnetosome.jpg" width="500" height="384" alt="Magnetoreception in bacteria">
Picture by Roman Klymenko
</center>
What else does the earth's magnetic field move?
[[compass]]
[[magnet]]
[[paperclip]] <img src="https://live.staticflickr.com/65535/50402802917_99379651e6.jpg" width="1000" height="100" alt="Investigation Game Header">
Good hypothesis, watch this video to find out if you're correct.
<iframe width="840" height="473" src="https://www.youtube.com/embed/t0rpiopd7Bs" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe>
When the magnet got close enough to the compass, the compass needle pointed towards the magnet’s south pole.
Why?
The compass is [[broken]].
Only [[opposite poles attract]] so the north arrow has to point towards the south pole.<img src="https://live.staticflickr.com/65535/50402802917_99379651e6.jpg" width="1000" height="100" alt="Investigation Game Header">
Good hypothesis. Watch this video to find out if you're correct.
<iframe width="840" height="473" src="https://www.youtube.com/embed/t0rpiopd7Bs" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe>
When the magnet got close enough to the compass, the compass needle pointed towards the magnet’s south pole.
Why?
The compass is [[broken]].
Only [[opposite poles attract]] so the north arrow has to point towards the south pole.<img src="https://live.staticflickr.com/65535/50402802917_99379651e6.jpg" width="1000" height="100" alt="Investigation Game Header">
Good hypothesis. Watch this video to find out if you're correct.
<iframe width="840" height="473" src="https://www.youtube.com/embed/t0rpiopd7Bs" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe>
When the magnet got close enough to the compass, the compass needle pointed towards the magnet’s south pole.
Why?
The compass is [[broken]].
Only [[opposite poles attract]] so the north arrow has to point towards the south pole.<img src="https://live.staticflickr.com/65535/50402802917_99379651e6.jpg" width="1000" height="100" alt="Investigation Game Header">
Let's try it with another compass to test your hypothesis.
<iframe width="840" height="473" src="https://www.youtube.com/embed/3ps0Y0qDMh4" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe>
Remember when we put 2 bar magnets together, which poles were attracted to each other?
[[opposite poles attract]] <img src="https://live.staticflickr.com/65535/50402802917_99379651e6.jpg" width="1000" height="100" alt="Investigation Game Header">
Yes! We know opposites attract; the north pole of one magnet is attracted to the south pole of another.
Knowing that the north arrow of a compass has to point towards the //magnetic// south pole of the earth, which picture is a better model of the earth?
[[North up]]
<a data-passage="North up" class="link-internal link-image"><img src="https://live.staticflickr.com/65535/50380277406_11119b2d84.jpg" width="500" height="375" alt="earth model- magnet north pole pointing up"></a>
[[South up]]
<a data-passage="South up" class="link-internal link-image"><img src="https://live.staticflickr.com/65535/50380457407_8df288f057.jpg" width="500" height="375" alt="earth model- magnet south pole pointing up"></a>
<img src="https://live.staticflickr.com/65535/50402802917_99379651e6.jpg" width="1000" height="100" alt="Investigation Game Header">
Is the compass pointing the right way in this picture?
<img src="https://live.staticflickr.com/65535/50380277441_ec145fcffe.jpg" width="500" height="375" alt="compass is pointing to south pole">
We'd better try [[South up]]
<img src="https://live.staticflickr.com/65535/50402802917_99379651e6.jpg" width="1000" height="100" alt="Investigation Game Header">
Great job! The compass needle is pointing towards the north pole.
<img src="https://live.staticflickr.com/65535/50379577823_835073da1a.jpg" width="500" height="375" alt="compass is pointing to north pole">
Your job is to design a model of the earth that shows the earth’s magnetic field AND demonstrates that magnets can exert a force on objects without touching them.
You already know a lot about magnets and magnetic fields. You know that opposite poles of magnets attract. That the magnetic field gets stronger the closer you get to a magnet. Make a hypothesis about what the earth's magnetic field looks like.
<center>
[[image 1]]
<a data-passage="image 1" class="link-internal link-image"><img src="https://live.staticflickr.com/65535/50401868407_fdf1788432.jpg" width="500" height="300" alt="Magnetic field Hypothesis 1"></a>
[[image 2]]
<a data-passage="image 2" class="link-internal link-image"><img src="https://live.staticflickr.com/65535/50401868322_f05e64eea1.jpg" width="500" height="555" alt="Magnetic field Hypothesis 2"></a>
[[image 3]]
<a data-passage="image 3" class="link-internal link-image"><img src="https://live.staticflickr.com/65535/50401710631_cb7086f7ba.jpg" width="308" height="500" alt="Magnetic field Hypothesis 3"></a>
</center><img src="https://live.staticflickr.com/65535/50402802917_99379651e6.jpg" width="1000" height="100" alt="Investigation Game Header">
Good hypothesis, let's test it by making a model of the earth.
What would you like to use to make your model?
[[Iron filings]]
[[A compass]]<img src="https://live.staticflickr.com/65535/50402802917_99379651e6.jpg" width="1000" height="100" alt="Investigation Game Header">
Good hypothesis, let's test it by making a model of the earth.
What would you like to use to make your model?
[[Iron filings]]
[[A compass]]
<img src="https://live.staticflickr.com/65535/50402802917_99379651e6.jpg" width="1000" height="100" alt="Investigation Game Header">
Good Hhypothesis, let's test it by making a model of the earth.
What would you like to use to make your model?
[[Iron filings]]
[[A compass]]<img src="https://live.staticflickr.com/65535/50402802917_99379651e6.jpg" width="1000" height="100" alt="Investigation Game Header">
What do you want to do with the iron filings?
<img src="https://live.staticflickr.com/65535/50379577833_835ab2bc59.jpg" width="500" height="375" alt="iron filings and magnet">
Move the magnet [[over]] the iron filings.
[[Sprinkle the iron filings]] around the magnet.
<img src="https://live.staticflickr.com/65535/50402802917_99379651e6.jpg" width="1000" height="100" alt="Investigation Game Header">
What do you want to do with your compass?
Find out which direction it points in different [[locations]] around the magnet.
Find out where it points at different [[distances]] from the magnet.
<img src="https://live.staticflickr.com/65535/50402802917_99379651e6.jpg" width="1000" height="100" alt="Investigation Game Header">
<iframe width="840" height="473" src="https://www.youtube.com/embed/Md4vzaGnstE" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe>
Most of the iron filings are now stuck to the magnet, some are not, there is not pattern in the iron filings.
Does this show that the magnet can [[exert a force]] on the iron filings,
or [[the shape of the magnet’s magnetic field?]]
<img src="https://live.staticflickr.com/65535/50402802917_99379651e6.jpg" width="1000" height="100" alt="Investigation Game Header">
<iframe width="840" height="473" src="https://www.youtube.com/embed/IOMbH76hVKM" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe>
Some of the iron filings moved, and some are now stuck to the magnet.
Does this show that the magnet can exert [[a force]] on the iron filings?
or [[the shape of the magnet’s magnetic field?]]<img src="https://live.staticflickr.com/65535/50402802917_99379651e6.jpg" width="1000" height="100" alt="Investigation Game Header">
Yes, it did exert a force; the iron filings moved, which is evidence of the magnetic force!
We didn't see the shape of the magnetic field though, what should we do?
Try to [[Sprinkle the iron filings]] over the magnet
Try using [[A compass]]
Try placing [[something between the magnet and the iron filings]]<img src="https://live.staticflickr.com/65535/50402802917_99379651e6.jpg" width="1000" height="100" alt="Investigation Game Header">
You made a hypothesis about what the magnetic field of the magnet would look like, do you see any evidence for that in either of the pictures below?
<center><img src="https://live.staticflickr.com/65535/50393855283_bb908ccfed.jpg" width="500" height="420" alt="results 2"> <img src="https://live.staticflickr.com/65535/50393855553_0b3ed2bd71.jpg" width="605" height="420" alt="results 1"></center>
No, we can't really see the shape of the magnetic field yet. It might help to try placing [[something between the magnet and the iron filings]]
Or try using [[A compass]] <img src="https://live.staticflickr.com/65535/50402802917_99379651e6.jpg" width="1000" height="100" alt="Investigation Game Header">
It's hard to tell, but you can see some of the iron filings are sticking to the ends of the magnet, which means it did exert a force; the iron filings moved, which is evidence of the magnetic force!
We didn't see the shape of the magnetic field though, what should we do?
Try to move the magnet [[over]] the iron filings.
Try using [[A compass]]
Try placing [[something between the magnet and the iron filings]]<img src="https://live.staticflickr.com/65535/50402802917_99379651e6.jpg" width="1000" height="100" alt="Investigation Game Header">
It might help to use something so that the iron filings cannot stick to the magnet. What if we place this sheet of plastic between the iron filings and the magnet, like in this picture. Now what would you like to do?
<center><img src="https://live.staticflickr.com/65535/50394715362_18383411bb.jpg" width="375" height="500" alt="plastic sheet between magnet and filings"></center>
[[Move the magnet over the top of the iron filings]]
[[Sprinkle the iron filings around the magnet]]
<img src="https://live.staticflickr.com/65535/50402802917_99379651e6.jpg" width="1000" height="100" alt="Investigation Game Header">
<iframe width="840" height="473" src="https://www.youtube.com/embed/vfBrAHe4tyQ" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe>
Closer, but we still don’t see a clear the pattern of a magnetic field
Try to[[Sprinkle the iron filings around the magnet]]
<img src="https://live.staticflickr.com/65535/50402802917_99379651e6.jpg" width="1000" height="100" alt="Investigation Game Header">
<iframe width="840" height="473" src="https://www.youtube.com/embed/uWRfaIZkaLs" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe>
Yes, we can now visualize the magnetic field!
Was your hypothesis correct?
[[Yes]]
[[No]]
<img src="https://live.staticflickr.com/65535/50402802917_99379651e6.jpg" width="1000" height="100" alt="Investigation Game Header">
Excellent
[[Continue]]<img src="https://live.staticflickr.com/65535/50402802917_99379651e6.jpg" width="1000" height="100" alt="Investigation Game Header">
That's ok, scientists get their hypothesis incorrect all the time.
[[Continue]]
<img src="https://live.staticflickr.com/65535/50402802917_99379651e6.jpg" width="1000" height="100" alt="Investigation Game Header">
You used either a compass or iron filings to show that the earth's magnetic field looks like this.
<center><img src="https://live.staticflickr.com/65535/50394715687_ef65d925a8.jpg" width="420" height="400" alt="magnetic field iron filings"> <img src="https://live.staticflickr.com/65535/50394715522_0e7e1816ed.jpg" width="695" height="400" alt="Magnetic field traced"></center>
The closer together the magenetic field lines are, the stronger the magnetic field at that point. Where on the earth do you think the magnetic field is stronger?
[[At the poles]]
[[At the equator]]
<img src="https://live.staticflickr.com/65535/50402802917_99379651e6.jpg" width="1000" height="100" alt="Investigation Game Header">
Let's use the iron filings to test this hypothesis. When I drop the magnet into the iron filings, they will stick where the magnetic field is strongest.
<iframe width="840" height="473" src="https://www.youtube.com/embed/tHcQBJ-iiKw" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe>
Where is the magnetic field strongest?
[[at the poles]]
[[at the equator]]
<img src="https://live.staticflickr.com/65535/50402802917_99379651e6.jpg" width="1000" height="100" alt="Investigation Game Header">
Let's use the iron filings to test this hypothesis. When I drop the magnet into the iron filings, they will stick where the magnetic field is strongest
<iframe width="840" height="473" src="https://www.youtube.com/embed/tHcQBJ-iiKw" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe>
Where is the magnetic field strongest?
[[at the poles]]
[[at the equator]]<img src="https://live.staticflickr.com/65535/50402802917_99379651e6.jpg" width="1000" height="100" alt="Investigation Game Header">
YES!
Great job, you've completed the investigation, go back to Canvas and answer the questions in the Investigation Assignment.
<center><img src="https://live.staticflickr.com/65535/50380277406_11119b2d84.jpg" width="500" height="375" alt="earth model 1"></center><img src="https://live.staticflickr.com/65535/50402802917_99379651e6.jpg" width="1000" height="100" alt="Investigation Game Header">
Are you sure?
<iframe width="840" height="473" src="https://www.youtube.com/embed/tHcQBJ-iiKw" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe>
Where is the magnetic field strongest and where do the most iron filings stick to this magnet?
[[at the poles]] or the ends of the magnet
[[at the equator]]or the middle of the magnet<img src="https://live.staticflickr.com/65535/50402802917_99379651e6.jpg" width="1000" height="100" alt="Investigation Game Header">
<iframe width="840" height="473" src="https://www.youtube.com/embed/WDZHHezv1Oc" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe>
Did the compass point in different directions depending on it was placed?
[[yes it changed directions]]
[[no it didn't]]
<img src="https://live.staticflickr.com/65535/50402802917_99379651e6.jpg" width="1000" height="100" alt="Investigation Game Header">
<iframe width="840" height="473" src="https://www.youtube.com/embed/S1v9ZjxyTjA" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe>
Did the compass point in different directions depending on it was placed?
yes [[it changed directions]]
no [[it didn't]]<img src="https://live.staticflickr.com/65535/50402802917_99379651e6.jpg" width="1000" height="100" alt="Investigation Game Header">
Yes it did, that's because the compass needle lines up with the magnetic field. Based on what you saw, can you determine the shape of the magnetic field?
<center>
[[I'm not sure]]?
[[img 1]]
<a data-passage="img 1" class="link-internal link-image"><img src="https://live.staticflickr.com/65535/50401868407_fdf1788432.jpg" width="500" height="300" alt="Magnetic field Hypothesis 1"></a>
[[img 2]]
<a data-passage="img 2" class="link-internal link-image"><img src="https://live.staticflickr.com/65535/50401868322_f05e64eea1.jpg" width="500" height="555" alt="Magnetic field Hypothesis 2"></a>
[[img 3]]
<a data-passage="img 3" class="link-internal link-image"><img src="https://live.staticflickr.com/65535/50401710631_cb7086f7ba.jpg" width="308" height="500" alt="Magnetic field Hypothesis 3"></a>
</center><img src="https://live.staticflickr.com/65535/50402802917_99379651e6.jpg" width="1000" height="100" alt="Investigation Game Header">
Are you sure? Go back and watch the video again, pay close attention to the [[locations]] of the compass needle
<img src="https://live.staticflickr.com/65535/50402802917_99379651e6.jpg" width="1000" height="100" alt="Investigation Game Header">
Watch this video to see if you're right
<iframe width="560" height="315" src="https://www.youtube.com/embed/fm2YwlPuZS4" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe>
Does this video show the [[shape of the magnetic field]]?
Does it show that magnetic fields [[can exert a force]] on magnets like the one in the compass needle?
Or does it show [[both]]?
<img src="https://live.staticflickr.com/65535/50402802917_99379651e6.jpg" width="1000" height="100" alt="Investigation Game Header">
Watch this video to see if you're right
<iframe width="560" height="315" src="https://www.youtube.com/embed/fm2YwlPuZS4" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe>
Does this video show the [[shape of the magnetic field]]?
Does it show that magnetic fields [[can exert a force]] on magnets like the one in the compass needle?
Or does it show [[both]]?<img src="https://live.staticflickr.com/65535/50402802917_99379651e6.jpg" width="1000" height="100" alt="Investigation Game Header">
Watch this video to see if you're right
<iframe width="560" height="315" src="https://www.youtube.com/embed/fm2YwlPuZS4" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe>
Does this video show the [[shape of the magnetic field]]?
Does it show that magnetic fields [[can exert a force]] on magnets like the one in the compass needle?
Or does it show [[both]]?<img src="https://live.staticflickr.com/65535/50402802917_99379651e6.jpg" width="1000" height="100" alt="Investigation Game Header">
Watch this video to see the shape of the magnetic field
<iframe width="560" height="315" src="https://www.youtube.com/embed/fm2YwlPuZS4" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe>
Does this video show the [[shape of the magnetic field]]?
Does it show that magnetic fields [[can exert a force]] on magnets like the one in the compass needle?
Or does it show [[both]]?<img src="https://live.staticflickr.com/65535/50402802917_99379651e6.jpg" width="1000" height="100" alt="Investigation Game Header">
Yes, it shows that the magnetic field looks like this
<center><img src="https://live.staticflickr.com/65535/50394715522_0e7e1816ed.jpg" width="500" height="287" alt="Magnetic field traced"></center>
Did you also see any evidence of the magnet moving something?
[[Yes, the compass arrow moved]]
[[No I need more evidence]]<img src="https://live.staticflickr.com/65535/50402802917_99379651e6.jpg" width="1000" height="100" alt="Investigation Game Header">
Yes, it shows that the magnetic can move the compass arrow, even though they aren't touching.
Did you also see any evidence of the magnet field?
[[Yes, I saw the magnetic field lines]]
[[No I need more evidence]]<img src="https://live.staticflickr.com/65535/50402802917_99379651e6.jpg" width="1000" height="100" alt="Investigation Game Header">
Yes, it shows that the magnetic field looks like this, AND that the magnet moves the compass arrow, even when they aren't touching!
<center><img src="https://live.staticflickr.com/65535/50379577848_e4f96a8e2b.jpg" width="500" height="386" alt="Magnetic field- hypothesis 1"></center>
[[Continue]]
<img src="https://live.staticflickr.com/65535/50402802917_99379651e6.jpg" width="1000" height="100" alt="Investigation Game Header">
Very good, you modeled the shape of the magnetic field and found evidence that magnets can exert a magnetic force!
[[Continue]]<img src="https://live.staticflickr.com/65535/50402802917_99379651e6.jpg" width="1000" height="100" alt="Investigation Game Header">
Try using the [[Iron filings]] to find evidence of magnets exerting a force on other objects.
or [[Continue]]<img src="https://live.staticflickr.com/65535/50402802917_99379651e6.jpg" width="1000" height="100" alt="Investigation Game Header">
Very good, you modeled the shape of the magnetic field and found evidence that magnets can exert a magnetic force!
<center><img src="https://live.staticflickr.com/65535/50394715522_0e7e1816ed.jpg" width="500" height="287" alt="Magnetic field traced"></center>
[[Continue]]
<img src="https://live.staticflickr.com/65535/50402802917_99379651e6.jpg" width="1000" height="100" alt="Investigation Game Header">
Yes it did, that's because the compass needle lines up with the magnetic field. Based on what you saw, can you determine the shape of the magnetic field?
[[Yes I can]]
[[I'm not really sure]]<img src="https://live.staticflickr.com/65535/50402802917_99379651e6.jpg" width="1000" height="100" alt="Investigation Game Header">
Go back and watch the video again. Pay close attention to the [[distances]] of the compass needle.<img src="https://live.staticflickr.com/65535/50402802917_99379651e6.jpg" width="1000" height="100" alt="Investigation Game Header">
Go back and watch the video again. Pay close attention to the [[distances]] of the compass needle.<img src="https://live.staticflickr.com/65535/50402802917_99379651e6.jpg" width="1000" height="100" alt="Investigation Game Header">
This video didn't show the shape of the magnetic field, it showed the [[size]], because we saw where the magnet's magnetic field influenced the compass, and where it didn't.
Was there evidence in the video that [[magnetic fields can exert a force]] on magnets?<img src="https://live.staticflickr.com/65535/50402802917_99379651e6.jpg" width="1000" height="100" alt="Investigation Game Header">
The magnetic field's size is based on the strength and size of the magnet. The earth is basically a giant bar magnet, so it's magnetic field reaches out into space.
Did the video show that [[magnetic fields can exert a force]] on magnets?
<img src="https://live.staticflickr.com/65535/50402802917_99379651e6.jpg" width="1000" height="100" alt="Investigation Game Header">
Yes there was! The compass needle moved because the magnet exerted a magnetic force on it.
We are still looking for evidence about the shape of the magnetic field.
Would you like to find out which [[locations]] the compass points in different places around the magnet?
Or use try investigating with the [[Iron filings]]