an essay on magnet in brief description
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A magnet is a material or object that produces a magnetic field. This magnetic field is invisible but is responsible for the most notable property of a magnet: a force that pulls on other ferromagnetic materials, such as iron, steel, nickel, cobalt, etc. and attracts or repels other magnets.
A "horseshoe magnet" made of alnico, an iron alloy. The magnet, made in the shape of a horseshoe, has the two magnetic poles close together. This shape creates a strong magnetic field between the poles, allowing the magnet to pick up a heavy piece of iron.
Magnetic field lines of a solenoid electromagnet, which are similar to a bar magnet as illustrated below with the iron filings
A permanent magnet is an object made from a material that is magnetized and creates its own persistent magnetic field. An everyday example is a refrigerator magnet used to hold notes on a refrigerator door. Materials that can be magnetized, which are also the ones that are strongly attracted to a magnet, are called ferromagnetic (or ferrimagnetic). These include the elements iron, nickel and cobalt and their alloys, some alloys of rare-earth metals, and some naturally occurring minerals such as lodestone. Although ferromagnetic (and ferrimagnetic) materials are the only ones attracted to a magnet strongly enough to be commonly considered magnetic, all other substances respond weakly to a magnetic field, by one of several other types of magnetism.
Ferromagnetic materials can be divided into magnetically "soft" materials like annealed iron, which can be magnetized but do not tend to stay magnetized, and magnetically "hard" materials, which do. Permanent magnets are made from "hard" ferromagnetic materials such as alnico and ferrite that are subjected to special processing in a strong magnetic field during manufacture to align their internal microcrystalline structure, making them very hard to demagnetize. To demagnetize a saturated magnet, a certain magnetic field must be applied, and this threshold depends on coercivity of the respective material. "Hard" materials have high coercivity, whereas "soft" materials have low coercivity. The overall strength of a magnet is measured by its magnetic moment or, alternatively, the total magnetic flux it produces. The local strength of magnetism in a material is measured by its magnetization.
An electromagnet is made from a coil of wire that acts as a magnet when an electric current passes through it but stops being a magnet when the current stops. Often, the coil is wrapped around a core of "soft" ferromagnetic material such as mild steel, which greatly enhances the magnetic field produced by the coil.
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What is a magnet? Magnet is an object that can create magnetic field by itself. It is usually made from iron. It had a pulling force called magnetism. The pulling force is able to pull at certain things like objects made of iron or steel. It can attract or repel other magnetic objects that are not even magnetized and of course other magnets too. Due to the characteristic of a magnet, it can give a great impact to our world. It has many benefits to the industrial field, the transportation in our modern world the medical field and also to the household of our daily lives. It can even generate electricity. However, everything comes with a downside, the magnet is not excluded. For an example, the MRI which is also called the Magnetic Resonance Imaging. MRI is a technique used in medicine to produce images of tissues inside a body. Physicians use these images to diagnose some injuries, diseases and also disorders. It is very important as a diagnostic tool since it can enable doctors or physicians to identify abnormal tissues without even doing any surgeries. The MRI does not expose patients to radiations. It is unlike the other tests that uses X-rays. Other than that, it can also let doctors and physicians look through bones and organs. MRI is a safe diagnostic tool for almost everyone
First and foremost, magnet plays an important role in our transportation
However, without any exceptions, there is also some downsides of the Magnetic Resonance Imaging. The MRI uses a strong and powerful magnet to operate. Therefore, people with metal implants such as the pacemakers or artificial joint could not do the MRI since it would harm them. Moreover, the MRI machines are extremely expensive and it must be placed in special facilities. As a result, they are mostly found in larger medical centers or also in private hospitals. People who are poor and do not have enough money could not do the MRI since it costs a lot to do
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