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how can u make and electric generator using only magnets? Answered

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Only magnets?

You need wire as well - any wire moving through a magnetic field (or magnetic field moving past a wire) will generate an electric current - the most common way is to spin a coil of wire within a magnetic field, or spin magnets past a coil.

 There's a nice design at http://www.youtube.com/watch?v=k7Sz8oT8ou0