Electromagnetic Field along the Power Overhead Line at
... gardens. Such a case is depicted in Fig. 1 showing the 2 x 110 kV line route changing its direction at the angle of 36°. To the right of the power line, there is an area intended for gardening. The line generates an electromagnetic field whose effect on the health of people residing beneath depends ...
... gardens. Such a case is depicted in Fig. 1 showing the 2 x 110 kV line route changing its direction at the angle of 36°. To the right of the power line, there is an area intended for gardening. The line generates an electromagnetic field whose effect on the health of people residing beneath depends ...
Slide 1
... Use a magnetic field to create a current • emf (electromotive force) ~ potential difference • Where does the energy come from? → work ! ...
... Use a magnetic field to create a current • emf (electromotive force) ~ potential difference • Where does the energy come from? → work ! ...
Brief History of Electromagnetics
... James Clerk Maxwell (Scotland, 1831-1879) • By the time that Maxwell died in 1879 at the age of 48, most scientists were not convinced of his prediction of electromagnetic waves. They had never been observed. No one knew how to generate them or to detect them. ...
... James Clerk Maxwell (Scotland, 1831-1879) • By the time that Maxwell died in 1879 at the age of 48, most scientists were not convinced of his prediction of electromagnetic waves. They had never been observed. No one knew how to generate them or to detect them. ...
General Properties of Electromagnetic Radiation
... If we look carefully at the equation ni = c/vi and remember that the speed of radiation in vacuum is constant and independent on wavelength, and since the velocity of radiation in medium i is dependent on wavelength, therefore the refractive index of a substance should be dependent on wavelength. Th ...
... If we look carefully at the equation ni = c/vi and remember that the speed of radiation in vacuum is constant and independent on wavelength, and since the velocity of radiation in medium i is dependent on wavelength, therefore the refractive index of a substance should be dependent on wavelength. Th ...
physics 100 prac exam#4
... 29. EM waves tend to be scattered the most by an object that is A. magnetic. B. a liquid. C. conducting. D. about the same size as the wave. E. reflective. ...
... 29. EM waves tend to be scattered the most by an object that is A. magnetic. B. a liquid. C. conducting. D. about the same size as the wave. E. reflective. ...
history_of_light
... • Different colors correspond to different wavelengths. • Travels at 300,000 km/sec. • Slows down in denser media. • Snell’s law, double slit, polarization, all explained. BUT – if it is a wave, something must be waving! Needs a medium. ...
... • Different colors correspond to different wavelengths. • Travels at 300,000 km/sec. • Slows down in denser media. • Snell’s law, double slit, polarization, all explained. BUT – if it is a wave, something must be waving! Needs a medium. ...
Chapter 23 – Electromagnetic Waves
... • Electric and magnetic fields contain energy, potential energy stored in the field: uE and uB uE: ½ 0 E2 electric field energy density uB: (1/0) B2 magnetic field energy density •The energy is put into the oscillating fields by the sources that generate them. •This energy can then propagate to l ...
... • Electric and magnetic fields contain energy, potential energy stored in the field: uE and uB uE: ½ 0 E2 electric field energy density uB: (1/0) B2 magnetic field energy density •The energy is put into the oscillating fields by the sources that generate them. •This energy can then propagate to l ...
magnetic dipole.
... principle of superposition. It states that fields are the vector sum of all the fields generated by all charges, near or far away. And, another principle (of relativity, this one) is that the velocity of light in vacuum is “c”. There are no problems with these principles in vacuum; there are however ...
... principle of superposition. It states that fields are the vector sum of all the fields generated by all charges, near or far away. And, another principle (of relativity, this one) is that the velocity of light in vacuum is “c”. There are no problems with these principles in vacuum; there are however ...
Electromagnetic Theory Chapter One: Vector analysis
... The definition of magnetic induction Forces on current-carrying conductors The law of Biot and Savart Elementary applications of the Biot and Savart law Ampere's circuital law The magnetic vector potential ...
... The definition of magnetic induction Forces on current-carrying conductors The law of Biot and Savart Elementary applications of the Biot and Savart law Ampere's circuital law The magnetic vector potential ...
Electromagnetic radiation
Electromagnetic radiation (EM radiation or EMR) is the radiant energy released by certain electromagnetic processes. Visible light is one type of electromagnetic radiation, other familiar forms are invisible electromagnetic radiations such as radio waves, infrared light and X rays.Classically, electromagnetic radiation consists of electromagnetic waves, which are synchronized oscillations of electric and magnetic fields that propagate at the speed of light through a vacuum. The oscillations of the two fields are perpendicular to each other and perpendicular to the direction of energy and wave propagation, forming a transverse wave. Electromagnetic waves can be characterized by either the frequency or wavelength of their oscillations to form the electromagnetic spectrum, which includes, in order of increasing frequency and decreasing wavelength: radio waves, microwaves, infrared radiation, visible light, ultraviolet radiation, X-rays and gamma rays.Electromagnetic waves are produced whenever charged particles are accelerated, and these waves can subsequently interact with any charged particles. EM waves carry energy, momentum and angular momentum away from their source particle and can impart those quantities to matter with which they interact. Quanta of EM waves are called photons, which are massless, but they are still affected by gravity. Electromagnetic radiation is associated with those EM waves that are free to propagate themselves (""radiate"") without the continuing influence of the moving charges that produced them, because they have achieved sufficient distance from those charges. Thus, EMR is sometimes referred to as the far field. In this jargon, the near field refers to EM fields near the charges and current that directly produced them, specifically, electromagnetic induction and electrostatic induction phenomena.In the quantum theory of electromagnetism, EMR consists of photons, the elementary particles responsible for all electromagnetic interactions. Quantum effects provide additional sources of EMR, such as the transition of electrons to lower energy levels in an atom and black-body radiation. The energy of an individual photon is quantized and is greater for photons of higher frequency. This relationship is given by Planck's equation E=hν, where E is the energy per photon, ν is the frequency of the photon, and h is Planck's constant. A single gamma ray photon, for example, might carry ~100,000 times the energy of a single photon of visible light.The effects of EMR upon biological systems (and also to many other chemical systems, under standard conditions) depend both upon the radiation's power and its frequency. For EMR of visible frequencies or lower (i.e., radio, microwave, infrared), the damage done to cells and other materials is determined mainly by power and caused primarily by heating effects from the combined energy transfer of many photons. By contrast, for ultraviolet and higher frequencies (i.e., X-rays and gamma rays), chemical materials and living cells can be further damaged beyond that done by simple heating, since individual photons of such high frequency have enough energy to cause direct molecular damage.