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Question:

how to make magnetic levitation? the components? how to build?

were having a project that is all about electromagnetics? can you suggest other? tnks

Answer:

If you hold two magnets together with like poles you will find they repel. You will also notice something else. Push them together, and you will find they tend to want to zip off to the side. It is like they are sitting on an imaginary slippery rubber hill. With levitation, the same issue comes up. This means you have to hold the magnets somehow to make them behave. I suggest you try to get a pair of donut shaped magnet (toroidal) if you can. Sit the two magnets on a non ferrous rod or tube that is pointing up. It should be something a bit less than the inside diameter of the magnets, and maybe a foot long. If the magnets are attracted (want to come together), turn one upside down. If this doesn't work, the magnets are the wrong type. You need ones that have the N and S poles on the top and bottom of the donuts (not on the rings inside and outside of donut). It is easy to test them before you buy. They should push each other apart holding them face to face in your hands the right way around. If one is an electromagnet (on the bottom) you can adjust the current to make the other move up and down. This could be a bolt with a coil of wire around it, a couple of hundred turns . it will be a bit fiddly, and you need an adjustable power supply.
Magnetic levitation can be done in a number of ways: 1. Superconducting Magnets. Pros: Very Stable Cons: Requires extremely low temperatures How to make: For this you would need a superconducting metal or material which can be made by using liquid nitrogen to cool. After which, place a magnet over the superconducting material. 2. Oscillating Magnetic Fields Pros: Only requires AC electricity and a magnet Cons: Difficult to build How to make: Create two electromagnets and space them apart. Hook up to an AC current (at least 60 hz) and place a magnet in between. 3. Rotation (levitron) Pros: Easy to make; only requires magnets Cons: Lasts only as long as angular momentum is sufficient How to make: Create a magnetic platform and a magnetic top. Make sure that the magnetic fields repel and spin the top over the platform as fast as you can 4. Diamagnetism Pros: Stable Cons: Floats only at a small height and requires strong magnets e.g. NdFeB How to Make: Get a small and light diamagnetic material e.g.graphite or bismuth and place it over strong magnets such a neodymium
If you want cheap experimental material (very powerful stable toroidal magnets)strip them from the magnetron's in scrap microwave ovens.

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