Beforewe unlocked the word electromagnetics let’s discuss first where does it camefrom, by defining its trunk which is Physics.
It is a widespread word with somany definitions. Physics is one of the most fundamental of the sciences.Scientists of all disciplines use the ideas of physics. It is also thefoundation of all engineering and technology. No engineer could design aflat-screen TV, without first understanding the basic laws of physics.
Electromagnetics undergoes in classical physics, it is hasfour fundamental forces of nature which determine the interactions betweenmatter and energy which include strong interaction, weak interaction,gravitational force and electromagnetic force. Scientists that specialize inelectromagnetism investigate phenomena such as electrically charged particles,magnetic attraction and electromagnetic fields. Since we’re done in physics lets nowdefine electromagnetics.
Itis all around us. In simple terms, every time we turn a power switch on, everytime we press a key on our computer keyboard, or every time we perform asimilar action involving an everyday electrical device, EM comes into play. Itis the foundation for the technologies of electrical and computer engineering,spanning the entire electromagnetic spectrum, from dc to light, from theelectrically and magnetically based technologies to the electronicstechnologies to the photonics technologies. It is abranch of physics in which electric and magnetic phenomena are studied. Anelectromagnetic field is made up of interdependent electric and magneticfields, which is the case when the fields are varying with time, that is, theyare dynamic. An electric field is a force field that acts upon material bodiesby virtue of their property of charge, just as a gravitational field is a forcefield that acts upon them by virtue of their property of mass. A magnetic fieldis a force field that acts upon charges in motion.
The principal domains ofelectromagnetism are the following ones: Electrostatics, Electrokinetics,Magnetostatics and Electrodynamics. These domains are very useful for the studyof macroscopic phenomena and in practical applications. The first of these toimpress humanity was the electrical phenomenon of lightning, often believed tobe a tool of heaven, and the less powerful magnetic force that causedlodestones to point north. The explanation and application of these invisibleforces during the eighteenth and nineteenth centuries vaulted electricalengineering to the forefront of commercial interest as motors, generators,electric lights, batteries, heaters, telephones, record players, and many otherdevices emerged. The second set is to delivered the ability to communicateinstantly without wires around the world, not only dots and dashes, but alsovoice, images, and data.
Third came electronics and photonics, the ability toelectrically manipulate individual electrons and atoms in vacuum and in matterso as to generate, amplify, manipulate, and detect electromagnetic signals. Thefourth set of electrical phenomena involves cybernetics and informatics — themanipulation of electrical signals so complex that entirely new classes offunctionality are obtained, such as optimum signal processing, computers,robotics, and artificial intelligence.