1. Magnets always have two poles
Even if you cut them in half. Magnetic monopoles do not exist –as far as we know. Magnets will always have two poles, a magnetic north and a magnetic south. If you don’t believe us, take a bar magnet and cut it in half. The two remaining pieces will still have a north and a south. You can cut it dozens of times and the results will be the same.
2. The most powerful Magnet
The most powerful magnet in the universe is actually a star called a magnetar. These are stars that have died off and had a supernova explosion. The magnetars are what is left over, and they are strong enough to destroy small planets if they get close enough. Luckily, there are only a dozen of these according to scientists, and they are far far far away from Earth.
3. Strong rare earth
Magnets can turn some metals into magnets. Ferromagnetic materials like iron can be magnetized with a strong permanent magnet. You can try it for yourself by rubbing a magnet on a screwdriver. The screwdriver will be able to pick up magnetic objects.
4. The Earth is like one big bar magnet
It has a magnetic north and a magnetic south, which is what the needle on a compass points to. However, this is geographically different than the actual north and south poles. Invisible magnetic field lines run from the north to south poles.
5. Some animals are affected by magnets
Magnets have been used to study bee communication patterns, migratory cycles and several other animal behaviors. This is because many animals can sense magnetic fields. For instance, some sharks are repelled by them and birds and turtles navigate by them.
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6. Magnets are ancient
Well, today’s man-made magnets may not be so ancient, but the Chinese are said to have used lodestone, a natural magnet as far back as date. In fact, ancient mariners are said to have used lodestones to help them navigate.
7. Magnetism is relativistic
That’s right — whenever you turn on an electromagnet and stick it to a fridge, you are demonstrating relativity. Why? According to the theory of special relativity, the distance along the direction of motion gets shorter — that is, a fast-moving car would look squished, even though the person in the car wouldn’t notice. That person would see everything around him or her as squished in the direction in which the individual was traveling.
8. Opposite Attract
The phrases opposites attract because of the way magnets work. Every magnet has a north pole and a south pole. It’s only possible for a magnet to fuse with another magnet if their opposite poles are touching.