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Referring to the photograph below, a magnet is stuck onto the head of a nail and the nail then hung off the positive terminal of a standard D-cell battery. Between the nail head and the magnet is a small aluminum "flag." The North end of the magnet is pointed up (and South down). A wire is soldered to the negative end of the battery as seen in the photograph.
A close-up view of the bottom end of the hanging nail is shown in the photograph at the right.
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Now suppose that you touch the free end of the wire to the magnet. This will result in a flow of electrical current around the loop consisting of the battery, the nail, the magnet, and the loop of wire.
What, if anything, will happen?
Click here for Answer #284 after April 30, 2007.
