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Electromagnetic field

Electromagnetic field
An electromagnetic field (also EMF or EM field) is a physical field produced by electrically charged objects. It affects the behavior of charged objects in the ...

In such cases the other component becomes manifest in other observer frames. That is, a pure static electric field will show the familiar magnetic field associated with a current, in any frame of reference where the charge moves. The way in which charges and currents interact with the electromagnetic field is described by Maxwell's equations and the Lorentz force law. The electric field is produced by stationary charges, and the magnetic field by moving charges (currents); these two are often described as the sources of the field. These vector fields each have a value defined at every point of space and time and are thus often regarded as functions of the space and time coordinates.

However, if either the electric or magnetic field has a time-dependence, then both fields must be considered together as a coupled electromagnetic field using Maxwell's equations. An electromagnetic field (also EMF or EM field) is a physical field produced by electrically charged objects. In the past, electrically charged objects were thought to produce two different, unrelated types of field associated with their charge property. However the general case of a static EM field with both electric and magnetic components present, is the case that appears to most observers.

The electromagnetic field extends indefinitely throughout space and describes the electromagnetic interaction. Likewise, any new motion of a charge in a region that seemed previously to contain only a magnetic field, will show that the space now contains an electric field as well, which will be found to produces an additional Lorentz force upon the moving charge. The first one views the electric and magnetic fields as three-dimensional vector fields. From a classical perspective in the history of electromagnetism, the electromagnetic field can be regarded as a smooth, continuous field, propagated in a wavelike manner; whereas from the perspective of quantum field theory, the field is seen as quantized, being composed of individual particles. An electric field is produced when the charge is stationary with respect to an observer measuring the properties of the charge, and a magnetic field as well as an electric field is produced when the charge moves, creating an electric current with respect to this observer. A consequence of this, is that any case that seems to consist of a "pure" static electric or magnetic field, can be converted to an EM field, with both E and M components present, by simply moving the observer into a frame of reference which is moving with regard to the frame in which only the “pure” electric or magnetic field appears. It affects the behavior of charged objects in the vicinity of the field. It is one of the four fundamental forces of nature (the others are gravitation, weak interaction and strong interaction). Over time, it was realized that the electric and magnetic fields are better thought of as two parts of a greater whole — the electromagnetic field. When an EM field (see electromagnetic tensor) is not varying in time, it may be seen as a purely electrical field or a purely magnetic field, or a mixture of both.

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Observers who see only an electric or magnetic field component of a static EM field, have the other (electric or magnetic) component suppressed, due to the special case of the immobile state of the charges that produce the EM field in that case. It affects the behavior of charged objects in the vicinity of the field. In the past, electrically charged objects were thought to produce two different, unrelated types of field associated with their charge property. An electromagnetic field (also EMF or EM field) is a physical field produced by electrically charged objects.

When an EM field (see electromagnetic tensor) is not varying in time, it may be seen as a purely electrical field or a purely magnetic field, or a mixture of both. The electromagnetic field extends indefinitely throughout space and describes the electromagnetic interaction. The first one views the electric and magnetic fields as three-dimensional vector fields. The electric field is produced by stationary charges, and the magnetic field by moving charges (currents); these two are often described as the sources of the field. Likewise, any new motion of a charge in a region that seemed previously to contain only a magnetic field, will show that the space now contains an electric field as well, which will be found to produces an additional Lorentz force upon the moving charge.

These vector fields each have a value defined at every point of space and time and are thus often regarded as functions of the space and time coordinates. Over time, it was realized that the electric and magnetic fields are better thought of as two parts of a greater whole — the electromagnetic field. Similarly, if only the magnetic field (B) is non-zero and is constant in time, the field is said to be a magnetostatic field. It is one of the four fundamental forces of nature (the others are gravitation, weak interaction and strong interaction). There are different mathematical ways of representing the electromagnetic field. However the general case of a static EM field with both electric and magnetic components present, is the case that appears to most observers. The way in which charges and currents interact with the electromagnetic field is described by Maxwell's equations and the Lorentz force law. An electric field is produced when the charge is stationary with respect to an observer measuring the properties of the charge, and a magnetic field as well as an electric field is produced when the charge moves, creating an electric current with respect to this observer. From a classical perspective in the history of electromagnetism, the electromagnetic field can be regarded as a smooth, continuous field, propagated in a wavelike manner; whereas from the perspective of quantum field theory, the field is seen as quantized, being composed of individual particles. As such, they are often written as E(x, y, z, t) (electric field) and B(x, y, z, t) (magnetic field).

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