Use a magnet! You use the magnet for a purpose. A magnet does not “move” in a vacuum. A magnet works best when applied in a certain direction. You can choose the direction, the strength and hardness, and even the frequency. What a magnet does is create an area of attraction (or force) where there’s an absence of the opposite force. The exact combination of magnetic field strength, frequency, magnet surface area, magnet size, and magnet properties plays a critical role in the magnet’s ability to generate these conditions and effects, not to mention the magnet’s ability to attract another magnet. If the magnetic strength (measured in Ohms) changes too quickly, a magnet won’t be able to draw near enough to another magnet until its magnet surface area is at least double the size of a nearby magnet, or you’re generating too much torque. If too big, you can get a weak magnet. If the frequency changes rapidly, you’ll get a noisy magnet. If you have a weaker magnet than the one you want, you’ll end up getting a stronger magnet that will be a little too strong. You can change the magnet’s magnetic field strength by changing its magnetic surface area. Here’s a diagram that might help with this:
There’s no exact formula for magnet magnetic properties, but you can work with an idea of how they might change if you made different magnets using the same materials:
Magnetic field strength (measured in Ohms) of each magnet can be:
Small (less than about 50 µm)
Medium (less than about 100 µm)
Large (more than about 500 µm)
Magnetic surface area (measured in Å) of each magnet can be:
Small (less than about 2.5 mm)
Medium (less than about 6 mm)
Large (more than about 15 mm)
Here’s another diagram, which may help to better visualize how magnetic properties may change if you used the same magnets with different magnets with similar surface areas:
If you have a similar magnet as the one you’re using in the test, but you’re creating a magnet stronger than it is already (say, by using it in the test as shown above), but it’s more than half of what it is now and you can’t pull enough of it in any direction, you’ll get the undesirable effect of a weak magnet—but it’s not a bad magnet! Now you know what you should do
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