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how to build a strong electro magnet? Answered

for my project, i would like to build a strong round electro magnet. i would like to know how i can build one.. i mean number of turns, current, diameter of wire. can we connect the coil to main power supply directly? i need a very strong magnetic field, one of my purpos is to levitate another magnet with out any support of strings (freely suspending in air).
thanx in advance.

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user
iceng (author)2012-06-08

And don't forget that you can add permanent magnets if the desired 
magnet gets too hot...  ,  ,  ,   ,  A

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user
steveastrouk (author)2012-06-08

If you really, really want to make strong magnets, look at Florida-Bitter coils.....

Steve

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