![]() Just let go with my finger, the compass needle wouldĪutomatically swing back and point in this direction again. Point in this direction is higher in energy than this one. So you can see that I'm actually moving the compass needle with my finger, and so it took energy. Tiny little mark right here on the table that I left in. Order to get the compass needle to point in this direction. You would have to put energy in, right? So here's my finger,Īnd so I had to rotate, I had to rotate the compass needle. Make the compass needle point in the opposite direction. Alright, so this is just what happens when you put a compass needle into the magnetic field of the Earth. So if this is the South pole down here, this must be the magnetic ![]() And so I'm sure some of you are like, "Whoa, that's the geographic North pole." and it is the geographic North pole, but if you're talking about magnets, it's actually the magnetic South pole because opposite poles attract. Of our little bar magnet, of our compass needle, this must be the magnetic South pole. And we know that opposite poles attract, so if this is the North pole So the magnetic moment, the compass needle is pointing North like that. Idea of the compass needle because we know that a compass needle, if you put 'em to theĮarth's magnetic field, the compass needle is going to point North and so that's what I have down here. Going to think about a proton, like a tiny magnet with a magnetic moment. Points in the direction of our dipole's magnetic field. And, therefore, we could also draw in the magnetic moment of the proton. Pole to the South pole and then go ahead and do it So we can draw a magnetic field line going from the North Way it's going to have a North pole and a South pole, and so I'm going to go ahead and cover- Color the North pole red, here. Alright, so using this same idea, we can go back to the proton and think about it like a compass needle. Pole and a South pole, and the magnetic moment is going to point in this direction. ![]() The magnetic dipole moment is also called the magnetic moment and it's a vector that points in the direction Alright, we could also think about the magnetic dipole moment So going from the North to the South for our magnetic field line. Magnetic fields, right? So magnetic field lines go from the North pole to the South. Like a tiny bar magnet, too, and so we can draw the Which I'll color in red here, and the South pole. So over here on the right, let's look at a compass needle, right, which has two poles. So, like a bar magnet or a compass needle. Right, is like a rotating sphere of charge, and any moving charge creates a magnetic field. ![]() Just as a visual aid, you can think about this proton The laboratory is a joint INRA / University of Bordeaux researchunit.Hydrogen atom is a proton and has a property called spin. The film was shot atthe Institute of Plant and Molecular Biology of INRA in Villenave d'Ornon nearBordeaux. Finally, it opens on various fields of application ofNMR and on the other equipment present in Bordeaux on the Metabolome platform. It provides some simplified data on the generation of NMR spectraand their interpretation. It presents in asimplified and educational way the basic principles of nuclear magneticresonance. It gives some information on the equipment usedon the analytical platform of the metabolome at Bordeaux. After abrief historical introduction of the discovery of magnetic fields applied toatomic structures, the video presents an explanation of the analysis NMR appliedto natural substances from plants.Īfter a brief historyof the discovery of magnetic fields applied to atomic structures, the filmpresents the principles of Nuclear Magnetic Resonance analysis applied tonatural substances from plants. ![]()
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