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Physics library
Course: Physics library > Unit 18
Lesson 2: Discovery of magnetic fieldsDiscovery of magnetic fields
Magnetic materials seem to have two sides (we could call them poles). Depending on orientation they can be attractive or repulsive. What is the shape of the force between fields? Created by Brit Cruise.
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Does the moon have a field like the earth?(22 votes)
@Judah Najera
Correct me if I am wrong but don't the Northern Lights have something to do with the Gases in the atmosphere interacting or interfering with the magnetic fields?(1 vote)
could you add some vocal to your videos more more more please(6 votes)
Sorry these are still in development, I'm about to post a bunch of new material soon with more instructions. The idea is to get you thinking & spark curiosity (not tell you exactly what's going on). Ideally we will lead from these basic observations to key inventions & equations.(8 votes)
What was he shaking in the transparent box?(5 votes)- what happend if I break the magnet(3 votes)
each broken part functions as a magnet. I am told that you can continue to divide magnets into smaller and smaller parts until you get to the molecular or perhaps even atomic level. If you want to try it yourself you can buy a cheap bar magnet and cut it with a hacksaw or similarly you could use a metal file to scrap off some dust; the dust should stick to anything made of iron or steel and other magnets.(3 votes)
Where can we find those lodestones?(3 votes)- Where does he get all these magnets?(3 votes)
u can get them in a store , online , or find them everywhere.(1 vote)
The letters S and N, what do they stand for? Are they diffrent types of magnites?(2 votes)- N stands for North and the north side is attracted to S which stands for south. North repels north and south repels south.(3 votes)
- From0:21till the end were those iron filings he was using?(2 votes)
- Yes, you can also do this by floating them in light coloured oil(2 votes)
- How can you tell if a metal is magnetic or not?(2 votes)
There are several types.
Diamagnetism: Every molecule has this. It is the ability to be repelled by a magnetic field.
Paramagnetism: Every molecule with unpaired electrons has this. It is where its magnetic moment can really be anywhere.
Ferromagnetism: Like Paramagnetism but the molecules retain the parallel arrangement. In other words every layer points in the same direction. Nickel, Iron, Cobalt and their alloys have this
Antiferromagnetism is similar but each layer points in the opposite direction of a layer right next to it. These exibit ferromagnetic and diamagnetic properties.
Ferrimagnetism is similar to antiferromagnetism because almost no magnetic field is produced. Most iron ores are ferrites and most ferrites are ferrimagnetic.
There is finally electromagnetism which is the attraction of positive and negative charges.(2 votes)
- Does it matter if you use N or S to attract the iron fillings?(2 votes)
Is there some kind of rating system to judge how strong a magnet is? Also, is there a rating system to tell judge potential magnetism of a material?(1 vote)
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