What is Electromagnetic Therapy
What is Electromagnetic TherapyWhat is Electromagnetic Therapy? Science is hard for a lot of us to understand sometimes so we took it upon ourselves to help give you an EM 101 lesson! In this blog, you will read everything from what EM is and does to the history and theory behind this beautiful science.
What Is It and How Does It Work?Electricity and magnetic energy exist inside of the human body. This energy also controls multiple areas of the body like the heartbeat, stimulates muscles, and more. Each of the ‘s in the human body contains a small amount of magnetic energy.
Electromagnetic Theory covers the basic principles of electromagnetism: experimental basis, electrostatics, magnetic fields of steady currents, motional E.M.F., and electromagnetic induction, Maxwell’s equations, propagation and radiation of EM waves, electric and magnetic properties of matter, and conservation laws. This is a graduate-level subject that uses appropriate mathematics but whose emphasis is on physical phenomena and principles.
Listening In on The Galaxy
All types of Electromagnetic radiations are useful inside the world of science. Take a look at radio waves as an example. Radio stations and ham radio operators of Earthwork with radio waves every day. These radio waves carry communications from one point to another.
Radio waves are also extremely important to astronomers. Astronomers are constantly listening to the radio waves of other galaxies to try and learn more information about their stars. Our stars give off large amounts of EM radiation across the entire spectrum, and we can study that radiation to learn more about the universe.
Joseph Henry, who became Secretary of the Smithsonian upon its establishment in 1846, was the first in a long line of scientists that were selected to lead the Institution. Henry was a physicist who had taught for twenty years, first at a college preparatory school in New York and then at Princeton. During these years, he became known among scientists throughout the United States and Europe for his groundbreaking research in electromagnetism.
Henry built upon the work of English scientist William Sturgeon, who in 1825 discovered that wrapping a wire around an iron core enhanced the magnetic effect. Henry experimented with various parameters: insulating the wire so that multiple layers could be wound on the core (Sturgeon had used bare wire with a layer of insulating shellac on the iron); winding several coils on the same core; connecting batteries end-to-end (in series) to increase the intensity (voltage) and side-by-side (in parallel—an alternative arrangement was to have larger plates in a single battery) to increase the quantity (current).
He found that a high-intensity source worked best with the coils connected to end-to-end (in series, making a single coil), while a high quantity source was better with the coil ends connected (in parallel). This was unknowingly a demonstration of Ohm’s Law which had been published in 1826 but was not yet widely known or understood.
Maxwell’s equations are a set of coupled partial differential equations that, together with the Lorentz force law, form the foundation of classical electromagnetism, classical optics, and electric circuits. The equations provide a mathematical model for electric, optical, and radio technologies, such as power generation, electric motors, wireless communication, lenses, radar, etc.
Together these two described how electric and magnetic fields are generated by charges, currents, and changes in the fields. The equations are named after the physicist and mathematician James Clerk Maxwell. Maxwell (between 1861 and 1862) published an early form of the equations that included the Lorentz force law. Additionally, Maxwell first used these equations to propose that light is an electromagnetic phenomenon.
Electromagnetic (EM) Waves
There are waves of energy and light moving all around us. In the form of TV and audio transmissions, gamma radiation from space, and heat in the atmosphere. Scientists call them all electromagnetic radiation. The waves of energy are electromagnetic (EM). This is because they have oscillating electric and magnetic fields.
Scientists discover them by their frequency or wavelength, going from high to low frequency (short to long wavelength). For a wave with a high frequency, it has a lot of energy. So it could be a gamma-ray or x-ray. If it has a low frequency, it has less energy and could be a TV or radio wave. All EM energy waves travel at the speed of light. No matter what their frequency or wavelength, they always move at the same speed. Some properties of waves, such as diffraction and interference, are seen in EM radiation. Scientists have figured out that there are tiny particles in these waves. These are photons. The photons are specific units, or packets, of energy. Sometimes those particles also interact with each other and change the way the light originally behaved.
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