Magnets, The Hidden Objects Powering Your Life

Short Wave
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Automatic TRANSCRIPT

Okay jeff brumfield. Where does our journey into the world of magnetism begin. It begins with a call to carlos. And a guy named tim murphy. They both work at the national high magnetic field laboratory in tallahassee florida. Normally you know. I do research and i learn about things but this time i just i just brought some bar magnets thought i would let you. That's all we do here so they just you know they're bigger and they give us money for it so expensive too. Yeah and they're painted. We paint them. They're so ready for this interview. They were born ready for this interview. These folks work with magnets all day long. Carlos heads the k. Twelve education programs for the lab. Tim is a physicist there. And like carlos was saying earlier they really feel like magnets need respect. I guarantee you that whatever direction you're looking right now unless you're in the wilderness. Right now there's probably a magnet in your line of sight and you just don't know it well and if you're you're in the wilderness you're standing on the biggest magnet that we have which is the earth the earth is a giant magnet with a pole and the south pole and where that magnetism comes from kind of complicated so for today. We're just going to stick to smaller baghdad's like the ones we use in our daily lives. Jeff i'll be honest. I don't really know what makes a magnetic field magnetic field. So how would you describe that which is kind of fascinating. Because you've turned yourself. Into the shortwave fisk there's gaps in my knowledge the only god what is a magnetic field exactly well so magnetic fields like i just said you know based on the field. Actually they're often said to north and the south pole and right opposite poles attract and light poles repel. So magnets can pull each other together. Push each other part in actually magnetism itself is half of fundamental force a called electromagnetism which also includes electric fields. But what i think is really fascinating is aside from gravity. Magnets are really the only fundamental force that we can just experience an encounter on a regular basis right and we can kind of see this magnetism action when we're playing around with magnets and they stick to certain metals right. Yeah yeah i mean the whole metal magnet thing is kinda complicated carlos. Tell you that everybody comes up. I see on. Tv shows all the time even the education tv shows. They say magnets metal. And i'm like no you got it wrong again. There's only three medals of her naturally magnetic iron nickel and cobalt. And what carlos means there is that there are only three medals that be permanent magnets that hold their magnetism forever and never other metals can stick to magnets but then there are a lot of medals. They can't so we just moved to. A new house has a stainless steel fridge. And guess what like all our fridge. Magnets don't work on this fridge anymore. so what makes them materials magnetic and others not so much well it actually all has to do with electrons. Oh our friends the electrons. Of course these are. The negatively charged particles in adams and when they flow they create electricity. That's right and whenever electrons move in in particular when they spin around something they generate a magnetic field as well as an electric field so magnetic fields have to do with spinning electrons exactly so the electrons are spinning around the atom and that makes like a little magnetic field but then in a permanent magnet. What happens is all. The atoms are facing the same direction. Imagine all these atoms lined up in a row and they kinda wanna do what their next neighbor is doing. So if their neighbor is pointed up right there magnetic moment is up than the one next to him says. Hey up is the the direction so they go up as well. So now you end up with a macroscopic magnetic field because all of these atoms are kind of lined up with their magnetic moments so all of these atoms facing the same direction is what creates one. Big magnet exactly. That's how permanent magnets work like the magnet. Cystic to your fridge. All the atoms in that baghdad are lined up in the same way and they make this big magnetic field that polls the magnet against your fridge and keeps it there. But then there's another kind of magnet and tim the guy you just heard there he actually works with this one. It's called an electromagnet for electro magnets. We actually don't care about the spin of the electron what we care about is the

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