The black rectangle represents a bar magnet.
The magnet's North and South
poles are labeled. The other item represents a compass; the red end
of the needle is the end that would point towards Earth's North Magnetic Pole. Notice that the red end of the compass needle points toward the south pole of the magnet. For historical reasons, what we call "Earth's North Magnetic Pole" is actually the south pole of Earth's magnetic field! Yikes!
Drag either the compass or the magnet around to explore the magnetic
field around the bar
magnet. Can you determine the shape of
the magnetic field?
(Note: If you cannot see the animation below, or it is not working properly,
you may need to download the latest Flash
player.)
This is an early draft version of this activity. We expect to replace it with
a better version soon. Some things to be aware of:
If you drag either the compass or the magnet off screen and let go, you
won't have any way to get them back. Reload/refresh the web page to start
over.
The behavior of the compass might be a bit different in the real world
when you place it on top of the magnet.
Earth has a magnetic field. If you imagine a gigantic bar magnet inside of Earth, you'll have a pretty good idea what Earth's magnetic field is shaped like. Of course, Earth DOESN'T have a giant bar magnet...more
The force of magnetism causes material to point along the direction the magnetic force points. Here's another picture of how this works. This picture shows where the magnetic poles of the Earth are to...more
Earth has a magnetic field with a north pole and a south pole. Earth's magnetic field is pretty much like the magnetic field around a bar magnet. Earth's North Magnetic Pole (NMP) is not in the same place...more
Uranus has a strange magnetic field. The magnetic poles of Uranus are not at all close to the geographic poles of Uranus. The main magnetic field of Uranus is tilted 59° away from the planet's spin axis....more