Electromagnetic induction is used in numerous areas, from medicine to the communication technologies segment and the electricity sector.
Electromagnetic induction is the name of a phenomenon that leads to the emergence of an electromotive force (EMF) in a body or a medium that is exposed to a magnetic field of variable nature.
It should be noted that experts in electronics and electromagnetism use the concept of electromotive force (which is often used synonymously with induced voltage ) in order to identify the electrical profile action that is produced by some source that is not electrical. Within the framework of electromagnetic induction and considering a closed loop linked to a conductor, meanwhile, it is possible to define the aforementioned electromagnetic force as the work of electromagnetic essence that, if moved around the loop at one time, would reach performed on a certain electrical charge .
With the aim of offering an informative article that is as complete and enriching as possible, below we will share interesting data focused on how and when electromagnetic induction was discovered and what applications and peculiarities it has, for example.
History of electromagnetic induction
It is interesting to note that the discovery of electromagnetic induction , as noted when reviewing archives on this topic, dates back to the years 1831 and 1832 . In the first case, the discovery involves Michael Faraday . This scientist of British origin, who also made valuable contributions on electrolysis and diamagnetism , appealed to the idea of lines of force to explain electromagnetic induction , which he detected after developing various experiments. In this regard, it emerged that this specialist carried out a test with a pair of wire solenoids , which he wound on a ring made of iron. In this context, he verified that by stimulating the flow of current through a single solenoid , the other current was temporarily induced in the remaining one. This phenomenon was called mutual induction .
Independently, Joseph Henry also made findings on this issue. Later, James Clerk Maxwell took advantage of Faraday 's contributions as support for the content of his quantitative electromagnetic theory .
Michael Faraday discovered and described the phenomenon known as electromagnetic induction.
Faraday's Law
Faraday's law , which even admits the names Faraday-Lenz law and Faraday's law of electromagnetic induction , indicates that, in a closed circuit , the electromotive force or induced voltage is directly proportional to the speed with which, along Over time, there is a change in the magnetic flux that passes through any surface with said circuit as its limit. It is worth keeping in mind that, in this context, the direction presented by the induced electromotive force is established by the so-called Lenz law . The latter, which is a consequence of the principle of conservation of energy , indicates that each induced voltage will acquire an orientation opposite to the variation in the magnetic flux that generated them.
An experiment carried out by Faraday made it possible to demonstrate the phenomenon of induction through the use of a pair of coils . The one on the right provided an electric current that flowed through a tiny coil, thus implanting a magnetic field . In the case of stationary loops, no induced current is evident. But if the smaller coil manages to move either outside or inside the large coil, the magnetic flux is modified, thus inducing a current that ends up being detected by a galvanometer .
This law identified with Michael 's last name is suitable for describing two different phenomena: one that has become popular as the electromotive force of movement caused by a magnetic force exerted in motion on a cable and the transformation electromotive force , which arises from a force electricity born from a magnetic field of changing characteristics.
Electromagnetic induction is used in numerous areas, from medicine to the communication technologies segment and the electricity sector.
Applications of electromagnetic induction
Electromagnetic induction is used in different ways and has a wide field of application. It is commonly useful for generating electricity . Transformers , specifically, are based on the phenomenon of electromagnetic induction , as occurs with an electric generator and an electric motor .
There is, to add another reference, the electromagnetic induction furnace intended for metal casting (through induction heating the temperature of stainless steel is increased, for example). Electromagnetic induction radars are also manufactured (there are parking sensors with an inverted alarm system equipped with a radar of this style).
It is worth noting that in recent years the segment of technology based on electromagnetic induction aimed at heating a metal has been growing in order to make the process more efficient and ecological. Nor should we ignore that in the field of agriculture, electromagnetic induction sensors have begun to be used with the aim of being able to measure the apparent electrical conductivity of the soil at various spatial scales.
It also adds allusion to the use of the principle of electromagnetic induction that Michael Faraday detailed in 1838 in order to generate advances within neuroscience , to cite one possibility. With it, transcranial magnetic stimulation , a non-invasive practice to stimulate the cerebral cortex , is specifically possible.