One of the first natural forces that human species discovered was probably magnetism, but the full potential of the magnetic substances have been realized only recently.
Short description of Magnetism
Magnetism is the force exerted by the electrons (negatively charged ions) of a magnet. It is the force, by which metallic elements like iron attract or repel each other. It also can be defined as the force between electric currents, which attracts when they are parallel to each other, and repels when they are in opposite directions.
Each magnet has two poles: north and south poles. The magnetic strength is maximum at these points. If a magnet is freely suspended, it automatically aligns itself in the north-south direction. The two same poles (N-N or S-S) of the magnets repel each other, and the opposite poles (N-S) attract each other. Other than iron, there are many other materials that get magnetized when placed in a magnetic field.
Tesla is the name of the unit used to measure the power of a magnet. The unit was named this way in the honor of one of the greatest scientists to have ever existed in history.
This Serbian scientist is named Nikola Tesla.
Metals like iron, cobalt and nickel create a magnet. All of these magnets possess a magnetic field and every magnet responds to it. This magnetic field spans a limited area and that is why we need to push an object close to the magnet to observe the effect.
History of Magnetism
Magnes, a shepherd from northern Greece called Magnesia, was most likely the first to discover mysterious magnetic rocks when the iron tip of his staff was pulled towards a stone as he passed over it 4,000 years ago. Magnes is said to have been tending his sheep in a region of northern Greece called Magnesia at the time. These rocks were named lodestones, and went on to be called magnetite some time later probably named after Magnes or Magnesia.
In the early A.D. years in Rome Pliny the Elder, a Roman author and naturalist who conducted significant scientific research in his lifetime, documented a hill that was made of a stone that attracted iron. Pliny attributed the powers of magnetite to the likes of magic and superstitious theories including the possibility that ships that had disappeared at sea had actually been attracted to magnetic islands.
In China people developed a mariner’s compass using the magnets. Therefore the ancient Chinese are also considered as one of the pioneers of research studies regarding magnetism. Shen Kuo, a Chinese scientist, wrote a book that described the working of a magnetic compass needle in the 11th century . But the Chinese navigated a compass using a splinter of lodestone floated on water as early as 2,000 A.D.
In year 1600 a physician William Gilbert was the first to actually research on the phenomenon of magnetism by using several scientific methods in England. He discovered that the Earth itself was a giant magnet, that magnets could be forged out of iron and that their magnetic strength could be lost or gradually decreased upon heating.
Uses of Magnets
The most known use of the magnet currently is the magnetic compass which is used to find the geographical directions.
Other common uses of magnets include medicine because the use of the magnets in the medical sciences is very effective. The magnets can stimulate the nerves in the human body and increase the blood circulation, also the magnets are used to heal the pains and the wounds of the athletes.
One of the best magnetic uses in medicine is perhaps Magnetic Resonance. Magnetic resonance imaging (MRI) is a test that uses a magnetic field and pulses of radio wave energy to make pictures of organs inside the body. MRI gives different information about structures in the body than the information that can be seen with an X-ray, ultrasound, or computed tomography (CT) scan. MRI also may show problems that cannot be seen with other imaging methods and most importantly the MRI doesn’t affect the body’s overall health during the scan the way X-rays obviously do.
I’d like to mention also that one of the most important uses of Magnetic Energy in the future should be focused on the so called Magnetic Motors. Why have all these cars that make our world more toxic each day when we could have a free energy-producing magnetic motor that could power the cars without the use of the current fuel?
This vision of the future would not only make our planet healthier, but it would also offer us the free energy without the need to pay for gas and such. There will no longer be a need to spend money on stuff that just ruins the atmosphere of our planet.