NATIONAL UNIVERSITY OPEN AND DISTANCE QUESTIONS.docx

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NATIONAL UNIVERSITY OPEN AND DISTANCE UNIT 1. INDIVIDUAL ACTIVITY ELECTROMAGNETIC THEORY AND WAVES Group: 203058ª_471 WORK PRESENTED BY: OMAR JAVIER ORDOÑEZ GARCIA TUTOR: WILMER HERNAN GUTIERREZ BASIC SCIENCE SCHOOL TECHNOLOGY AND ENGINEERING ECBTI

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Explain the practical application of the loss tangent with an example The type of medium can be determined by the tangent of losses because it is a measure of the quality of an insulation, the lower the conduction current compared to the displacement current, the better the quality of the electrical insulation. The classification of the media can be established taking into account that the greater the angle of losses, the greater the current component will be compared to the displacement current, that is, the conductor will be the medium. What type of information gives us the propagation speed in the propagation of electromagnetic waves? Can we say that the propagation speed is proportional to the frequency of the signal? Rta \ In the practical sense, the speed of propagation of a wave, allows to know the direction, module and direction of it. The speed of propagation is the distance that a wave advances in a given time. To determine it, the following formula is used: V = λ * f Where: V = Speed of propagation λ = Wavelength (m) f = Frequency (Hz)
In the case of electromagnetic waves when they propagate in a vacuum, they have a constant speed of 299,792,458 km / s Speaking of proportionality between the velocity of propagation and the frequency of the signal, Yes a wave of wavelength L and frequency 2U will move twice as fast as a wave of length L but of frequency U. In short, it depends on the frequency propagation speed . -Explain how an electromagnetic wave behaves in free space, perfect dielectrics and good conductors. Electromagnetic waves are not only used in our technological civilization, but are in the very essence of Nature. Everything we know exists with electromagnetic waves. The warm light that enters innocently in our room during a cold winter morning, fills the environment with a complex network of electromagnetic fields rapidly oscillating everywhere around us. First of all, electromagnetic phenomena have always intervened in the formation and evolution of the Universe (which would be about 13700 million years old, according to the "Big Bang" Theory), and in particular of the Earth (which would be 4540 million years old). ). Secondly, through the electromagnetic waves we get the luminous energy of the Sun (mainly IR, VIS and UV), which has always influenced the creation and evolution of Life on Earth (that is, for more than 3500 millions of years). Third, on Earth there can be Astronomy and Radioastronomy thanks to the arrival of electromagnetic waves coming from the events and objects of the Cosmos to which we belong.

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