Date: Around 1993
I am interested in information about MHD for a science fair
project. I need to know how I can build a magnet for a desk-top size
experiment. How much magnetic energy is required? How many volts will I need
for the electrical energy?
There are many books that will give a good description. You
could buy some insulated wire from a hardware store, the type they use for
doorbells, wrap it around a steel bolt, and run the current from a dry cell
battery and it will be a magnet. The magnet will be strong enough to pick up
light paper clips, but not much more. It does take lots of current to make
You can make a demo MHD from a magnet and magnetic marbles. The
marbles can be purchased at places like Toys-R-Us. Make sure that the magnets
inside are spherical not the cheap Asian stuff which is cylindrical.
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Update: June 2012