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    tyler91392's Avatar
    tyler91392 Posts: 1, Reputation: 1
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    #1

    Feb 8, 2007, 10:09 PM
    How do u make an electromagnet?
    How do u make a powerful electromagnet? What do u need?
    Capuchin's Avatar
    Capuchin Posts: 5,255, Reputation: 656
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    #2

    Feb 9, 2007, 12:40 AM
    An electromagnet is basically a coil of wire.

    You can make it stronger by putting a soft iron core in your coil, increasing the number of loops, and increasing the current going around the coil.



    Where B is the magnetic field, mu is the permeability of the core, N is the number of turns per unit length, I is the current, and L is the length of coil.

    Most magnets saturate at 1-2 teslas, they are investing in 7T magnets for use in PET scanning, this is achieved with liquid helium (i think) cooling.
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