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By E. Krause

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The field of a magnet is rather complicated. It’s straight up only directly over the center of the magnet, and it diverges toward the horizontal away from the center of the magnet, as illustrated here. Field lines around a magnet The Nail That Stands on Its Point and One That Won’t In order for a nail to stand up straight, the magnet must be close enough to the nail that the torque from the field is great enough to lift the nail against the force of gravity. Also, the nail must be short enough that it doesn’t extend very far into the region above the magnet, where the field diverges toward the horizontal.

The bracket can be constructed in a variety of ways; the key is to use a vertical brace that is not made of a magnetic substance. You may use aluminum, as shown here, as it’s nonmagnetic. Use your imagination! The sizes of the washers and magnet used in this experiment are not critical, either. A washer wants to stand parallel to the local field at the end of the magnet and will stay vertical when placed on the aluminum plate opposite to the magnet, as shown in the second photo. Try it! The washer will readily roll up and down on the aluminum fixture when the magnet is moved, which is not all that surprising.

In the presence of a magnetic field that is perpendicular to its surface, the black liquid will rise up and form a many-pointed surface. The greater the field strength, the more points that are formed. ” A magnetic hedgehog Another view of the hedgehog The Magnetic “Hedgehog” The next photo shows a “hedgehog” formed by a stack of ring magnets. The hollow space in the middle of the design corresponds to the hole in the magnets below the dish. A smaller magnetic field produces fewer but larger spikes.

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