Electromagnet Project
Quatr.us answers questions

Electromagnets

Electromagnet

You can build your own electromagnet. Get about five meters of copper magnet wire (you can buy it at Radio Shack), a large iron nail or another piece of iron about the same size like a butter knife, a rubberband, some sandpaper, and an AA battery.

Wind all of the copper wire around and around the iron nail, being sure to always go in the same direction so the electrons will all be flowing the same way. When you're done, use the sandpaper to sand off the enamel coating from the very tips of your copper wire - just the last centimeter at each end of the wire. The wire will be a different color under the enamel coating.

Now connect your electromagnet to the AA battery, one wire touching the negative end and one wire touching the positive end. Use the rubberband to hold the wires in place. Is your electromagnet working - will it attract paper clips? How does it react to Brio trains? (Note: it will get warm - that's normal - it's from the friction of all those electrons pushing their way through the wire.)

For more excellent suggestions of projects with electromagnets, check out these projects from Hila Science Camp

Here's another great one: build an electric motor

Learn by Doing - Magnets
Learn by Doing - Making a compass
More about magnets
More about Electromagnets
The invention of the compass
More about Electricity

Bibliography and further reading about magnets and electricity:

Physics
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Professor Carr

Karen Eva Carr, PhD.
Assoc. Professor Emerita, History
Portland State University

Professor Carr holds a B.A. with high honors from Cornell University in classics and archaeology, and her M.A. and PhD. from the University of Michigan in Classical Art and Archaeology. She has excavated in Scotland, Cyprus, Greece, Israel, and Tunisia, and she has been teaching history to university students for a very long time.

Professor Carr's PSU page

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