Electromagnetic fields and radiation all around us.It is enough to flip a switch - and the light comes on, turn on your computer - and you are online, dial a number on your mobile phone - and you can communicate with distant continents.In fact, it created the modern electrical appliances world as we know it.However, in recent years it has increasingly raised the issue that the electromagnetic fields (EMF) generated by electrical equipment, are harmful.Is it so?Try to understand.
Let's start with definitions.Electromagnetic fields, as we know from school physics course, are a special kind of matter.A key feature of these fields - is the ability to interact in a certain way with the bodies and particles having an electric charge.As the name implies, electromagnetic fields are a set of magnetic and electric fields, and in this case they are so closely interrelated that they are considered a single entity.Features of interaction with charged objects are explained with the help of the Lorentz force.
first electromagnetic field were mathematically expressed in the theory of Maxwell in 1864.In fact, it was he who showed the indivisibility of magnetic and electric fields.One consequence of the theory is the fact that any disturbance (changes) of the electromagnetic field is the cause of electromagnetic waves propagating in a vacuum at the speed of light.Calculations showed that light (all part of the spectrum: infrared, visible, ultraviolet) is just an electromagnetic wave.Generally, classifying emission wavelength distinguish X-ray, radio and so forth.
appearance of Maxwell's theory was preceded by the work of Faraday (in 1831) for the study of electromagnetic induction in a conductor moving or placed in an alternating magnetic field.Even earlier, in 1819, H. Oersted noticed that when near a conductor put compass, its needle deviates from the natural magnetic pole of the Earth, suggesting a direct connection of magnetic and electric fields.
All this suggests that any electrical generator is an electromagnetic wave.This property is particularly pronounced for some specific devices and high current circuits.Both the first and second are now present in almost every home.Since the EMF is distributed not only in conducting materials, and dielectrics (e.g., vacuum), the person is constantly in the zone of their action.
If earlier, when the room was only a "light Ilyich", the question no one bothered.Now everything is different: the measurement of the electromagnetic field is performed using special instruments to measure the field strength.Both components are fixed in a certain range of EMI frequencies (depending on the sensitivity of the device).The document indicated SanPin PDN (permissible norm).In enterprises and large companies regularly scan PDN EMF.It should be noted that the final results of studies on the effects of electromagnetic fields on living organisms is still there.Therefore, for example, when working with computer technology are encouraged to organize a 15-minute break after every hour - just in case ... Everything is explained simply enough: around the conductor has a magnetic field, then there is also the EMF.The equipment is completely safe in the event, out of the socket when unplugged.
obvious that completely eliminate the use of electrical appliances, few dare.However, you can further protect themselves by connecting home devices into a grounded network, allowing potential is not going on the body, and "drain" in the grounding circuit.Various extensions, especially in the coiled rings reinforce EMF due to mutual inductance.And, of course, you should avoid close placement of multiple devices included.
