It is ubiquitous and has a wide range of industrial uses, but many people are still a little hazy about it. Today's article is about electromagnetism.
The definition
The electromagnetic field is the field of action created by electric and magnetic fields that fills the entirety of space.
While an electric field is the result of a charge that generates static electricity and produces an electric current in an electric conductor, an electric field is the magnetic field results from the movement of the electric charge and is expressed as a magnetic force.
The electromagnetic force is one of the four basic forces found in nature. The other three are:
- the nucleus that holds the atom together strong nuclear force;
- responsible for certain types of radioactive decay (beta decay) weak nuclear force;
- the mass attraction, i.e. gravitational force.
The electromagnetic refers to the close relationship between electricity and magnetism.
Changes in the magnetic field create an electric field called electromagnetic induction, which enables the existence of widespread everyday devices such as dynamos and generators, electric motors and transformers.
Discover
The effect of a lightning strike on a compass first observed by the sailors. Written for the first time William Gilbert - Court Physician to Queen Elizabeth I of England - in the 1600 De Magnete, Magnetisque Corporibus et De Magno Magnete Tellure mentioned that both electricity and magnetism can attract or repel objects, but they are different phenomena. The most important difference is that magnets have a rotating effect and electric force has an attractive effect.
The link between lightning and electricity Benjamin Franklin In 1752, the relationship between electricity and magnetism Gian Domenico Romagnosi in 1802.
Electromagnetism Hans Christian Ørsted It was his experiment in 1820 that made him a household name.
The electromagnet
An electromagnet is usually a soft iron a core surrounded by at least one roll. A in rolls electric current creates a magnetic field, which is oriented according to the right-hand rule. Since the lines of force inside the coil are in the same direction, a magnetic flux is created in the iron, which allows it to attract magnetizable materials. It loses its magnetic properties when the electric current ceases.
Strength of the electromagnet
- the amount of current flowing in the coil;
- the number of threads on the reel;
- the material and relative permeability of the iron core;
- the shape and size of the iron core
dependent.
The electromagnet very wide range of applications:
A electric motors generate kinetic energy using direct or alternating current.
As a freight receiver magnetizable Materials raising used in. They control whether the magnet lifts or releases the material by switching the electric current on and off.
Cableway for vehicles with rail brakes ensures effective braking.
In computers for data storage (winchester), in medical diagnostics for imaging (MRI) are used.
The image is from From Pixabay downloaded.
