Electromagnetism

Here is the fifty-third episode of Quantum Foam, Electromagnetism. We want to go over certain subjects in order to have prerequisites met for higher-level topics. Electromagnetism is the branch of physics that studies the interactions between electric charges and the resulting electric and magnetic fields unifying electricity, magnetism, and light into a single framework. The electromagnetic field is 1 of the 4 fundamental forces of nature. There are 3 subdivisions, electrostatics, magnetostatics, and electrodynamics. Electric forces allow different atoms to combine into molecules. Magnetic moments also play a role in chemical reactivity. Electromagnetism plays a role in modern technology. This is a fundamental subject that is known to be correct. Albert Einstein said that he stood on the shoulders of James Clerk Maxwell. Quantum Electrodynamics modifies Maxwell's equations to be consistent with the quantized nature of matter. An electromagnetic field is a physical field varying in space and time that represents the electric and magnetic influences generated by acting on electric charges. Any point in space can be categorized by an electric field and a magnetic field in flux. This is an electromagnetic wave. It is sometimes useful to describe electromagnetic fields in terms of potential energy and momentum. Electrostatics is the branch of physics that studies slow moving or stationery electric charges on macroscopic objects where quantum effects can be neglected. Magnetostatics is the study of magnetic fields in systems where the currents are steady and not changing with time. There is a connection with this area of micromagnetostatics and our flash memory that is used on today's linear computers. Classical electromagnetism was developed between 1820 and 1873. Electromagnetism is a science of charge and of the forces and fields associated with charge. Electricity and magnetism are 2 aspects of electromagnetism. In 1905, General Relativity established without a doubt that electromagnetism describes electric and magnetic phenomena. Electrical and magnetic forces can be detected in regions called electric and magnetic fields. These fields are fundamental in nature and can exist in space far from the charge or current that generated them. James Maxwell showed that electric and magnetic fields travel together through space as waves of electromagnetic radiation. His equations provide a complete and elegant description of electromagnetism down to, but not including the subatomic scale. Electromagnetic forces have been combined into a common force called the electroweak force. Putting all the forces into 1 grand unified theory has not been achieved to date. An important aspect of electromagnetism is the science of electricity, which is concerned with the behavior of aggregates of charge including the distribution of charge within matter and the motion of charge from place to place. Voltage is the measure of the propensity of charge to flow from one place to another. When a light bulb is switched on, a current flows through a thin filament in the bulb. The current heats the filament to such a high temperature that it glows, illuminating its surroundings. Charge is a basic property of matter. Most bulk matter has a net positive and negative charge balance. Charges repel each other. The principle of charge conservation is a fundamental law of nature. The charge of an isolated system cannot change. Electric and magnetic forces are caused by electromagnetic fields. The term field denotes a property of space so that the field quantity has a numerical value at each point in space. These values may also vary with time.