faradys law of
indus voltage
Answers
Any change in the magnetic environment of a coil of wire will cause a voltage (emf) to be "induced" in the coil. ... The induced emf in a coil is equal to the negative of the rate of change of magnetic flux times the number of turns in the coil....
Faraday’s Law of Induction describes how an electric current produces a magnetic field and, conversely, how a changing magnetic field generates an electric current in a conductor. English physicist Michael Faraday gets the credit for discovering magnetic induction in 1830; however, an American physicist, Joseph Henry, independently made the same discovery about the same time, according to the University of Texas.
It is impossible to overstate the significance of Faraday’s discovery. Magnetic induction makes possible the electric motors, generators and transformers that form the foundation of modern technology. By understanding and using induction, we have an electric power grid and many of the things we plug into it.
Faraday's law was later incorporated into the more comprehensive Maxwell’s equations, according to Michael Dubson, a professor of physics at the University of Colorado Boulder. Maxwell’s equations were developed by Scottish physicist James Clerk Maxwell to explain the relationship between electricity and magnetism, essentially uniting them into a single electromagnet force and describing electromagnetic waves that make up radio waves, visible light, and X-rays.
Electric charge is a fundamental property of matter, according to the Rochester Institute of Technology. Although it is difficult to describe what it actually is, we are quite familiar with how it behaves and interacts with other charges and fields. The electric field from a localized point charge is relatively simple, according to Serif Uran, a professor of physics at Pittsburg State University. He describes it as radiating out equally in all directions, like light from a bare light bulb, and decreasing in strength as the inverse square of the distance (1/r2), in accordance with Coulomb’s Law. When you move twice as far away, the field strength decreases to one-fourth, and when you move three times farther away, it decreases to one-ninth.
Protons have positive charge, while electrons have negative charge. However, protons are mostly immobilized inside atomic nuclei, so the job of carrying charge from one place to another is handled by electrons. Electrons in a conducting material such as a metal are largely free to move from one atom to another along their conduction bands, which are the highest electron orbits. A sufficient electromotive force (emf), or voltage, produces a charge imbalance that can cause electrons move through a conductor from a region of more negative charge to a region of more positive charge. This movement is what we recognize as an electric current.
Magnetism
In order to understand Faraday’s Law of Induction, it is important to have a basic understanding of magnetic fields. Compared to the electric field, the magnetic field is more complex. While positive and negative electric charges can exist separately, magnetic poles always come in pairs — one north and one south, according to San Jose State University. Typically, magnets of all sizes — from sub-atomic particles to industrial-size magnets to planets and stars — are dipoles, meaning they each have two poles. We call these poles north and south after the direction in which compass needles point. Interestingly, since opposite poles attract, and like poles repel, the magnetic north pole of the Earth is actually a south magnetic pole because it attracts the north poles of compass needles.
A magnetic field is often depicted as lines of magnetic flux. In the case of a bar magnet, the flux lines exit from the north pole and curve around to reenter at the south pole. In this model, the number of flux lines passing through a given surface in space represents the flux density, or the strength of the field. However, it should be noted that this is only a model. A magnetic field is smooth and continuous and does not actually consist of discrete lines.
A magnetic field is often depicted as lines of magnetic flux. In the case of a bar magnet, the flux lines exit from the north pole and curve around to reenter at the south pole. In this model, the number of flux lines passing through a given surface in space represents the flux density, or the strength of the field. However, it should be noted that this is only a model. A magnetic field is smooth and continuous and does not actually consist of discrete lines.