Danger of electromagnetic field and protection from its influence. Scheme, description

ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Danger of electromagnetic field and protection from its influence. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Electrical safety, fire safety

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Electric current - an ordered directed flow of electrons - is an invisible phenomenon, but you can still feel it tactilely (although it is better never to do this). But from the school physics course it is known that any conductor that conducts electric current is shrouded in electromagnetic radiation, that is, it creates an electromagnetic field around itself.

The electromagnetic field of alternating current, in fact, is an ephemeral phenomenon: it cannot be seen, it is impossible to touch it. It can only be detected with highly sensitive instruments. The magnetic field is characterized by an indicator of magnetic induction, measured in tesl (Tl).

Household electrical equipment is capable of generating a magnetic field, the physical value of which does not exceed millionths of a tesla, therefore, when characterizing a magnetic field, it is generally accepted to take microtesla (μT) as a unit of measurement. Electric current flows only through conductors, it is locked in them. The electromagnetic field fills the entire space surrounding the conductor, it penetrates through any obstacles, including inside the human body.

Why is an electromagnetic field dangerous?

Scientists involved in the study of electric current and everything connected with it, based on the processing of a large amount of statistical data, made an assumption: the magnetic field, or rather, its effect on a person, is unsafe for the latter. When speculation turned into certainty, large-scale epidemiological studies were carried out in many countries, the results of which cannot be called comforting. So, the constant presence of healthy people in zones of electromagnetic radiation with an induction of 0,3-6 μT sometimes causes irreversible changes in their body: the risk of developing leukemia increases by 3-4 times, oncological diseases - by 2 times, and all this against the background of melancholy , depression, irritability, weakening of sexual desire, asthenia.

In the course of these studies, a hygienic standard for a low-frequency magnetic field with an induction of 0,2 μT was derived, which is considered to be a safe level. Compliance with this standard in many developed countries (for example, in Sweden, whose scientists first sounded the alarm about this) is not only recommended in the construction and manufacture of household appliances, but also elevated to the rank of law (similar to other sanitary and epidemiological standards).

Author: Korshevr N.G.

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Nanobots to be launched into human veins 30.07.2016

Researchers at Drexel University have demonstrated how an electromagnetic field can be used to make tiny robots move faster in a liquid medium. Scientists plan to use these devices in the future to deliver drugs through blood vessels.

Nanobots are chains of tiny round particles. The magnetic field rotates the particles, like a screw, while the longer the chain, the greater the speed it can develop. The scientists tested various robots, starting with strings of three "beads". The longest device consisted of 13 particles and reached a speed of 17,85 micrometers per second.

In order for the robots to move, an external magnetic field was applied. The faster the rotation speed of the field, the faster the chains moved. At the same time, the high frequency led to the division of long devices into shorter ones. So, a robot of seven beads, upon reaching a certain speed, begins to deform and is divided into two chains of three and four particles. The direction of the magnetic forces can be changed so that the two robots move in opposite directions.

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