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If you use 6 magnets on a metal cube is it possible to make the cube levitate?

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It is fundamentally impossible to have anything stably levitate using only traditional, static magnets, no matter how clever your design. You have to either cheat by attaching the levitating object to a pole or cable to keep it stable, or you have to use changing magnetic fields. Two popular options for using changing magnetic fields for levitation are:

1. Superconductors. These naturally alter their internal currents to trap magnetic fields lines on the surface, which can be used for levitation:

http://en.wikipedia.org/wiki/Superconductivity

2. Adaptive fields with an intelligent feedback loop. Such a device senses the object falling to one side and changes the magnetic field constantly to compensate:

http://en.wikipedia.org/wiki/Electromagnetic_suspension

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I would not have guessed that.... very interesting!
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Another question... Would a magnetic wave cancel out if hit with another magnetic wave the same way a sound wave cancels out
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YES. It's called destructive interference and is used in thin films coatings on optical components to reduce reflection, among other things. Note that a magnetic wave is just another name for electromagnetic wave or light (visible and non-visible). You can't create a changing magnetic field (such as a wave) without it turning into light because a changing magnetic field automatically creates a changing electric field, which then creates back a changing magnetic field, and so on in a feedback process we commonly call "light".
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You just knew this on the top of your mind?
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Yes. I am physics professor. I am paid to have this on the top of my mind.
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anything is possible with magnets but you must have some way to adjust the amount is f magnativity to balance it

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It is possible to make the metal cube to levitate. However, some of the factors that will affect the success of the levitation include the strength of the magnet and size of the cube.

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To levitate something by a magnetic field, remember that like poles repel. This means you have to have magnets on the thing being levitated and the thing you're using to levitate it.

You should not need to vary the magnetic force, as the distance will self adjust. But you will need something that stops the parts sliding away from each other...

You can't just levitate a chunk of metal with a magnet, because the chunk will be attracted to the magnet, not repelled (unless it's also a magnet).