The classic US stereotype of attempted Iranian ideological indoctrination via chants of Death to America and such has been old hat for quite some time. In such cases the other component becomes manifest in other observer frames. 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. However the general case of a static EM field with both electric and magnetic components present, is the case that appears to most observers. 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. 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 Maxwells equations. Similarly, if only the magnetic field B is non zero and is constant in time, the field is said to be a magnetostatic field. If only the electric field E is non zero, and is constant in time, the field is said to be an electrostatic field. As such, they are often written as Ex, y, z, t electric field and Bx, y, z, t magnetic field.
Amiga Forever Plus Iso 9000' title='Amiga Forever Plus Iso 9000' />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. The first one views the electric and magnetic fields as three dimensional vector fields. There are different mathematical ways of representing the electromagnetic field. rsted discovered the effect of electricity through a wire on a compass needle, electricity and magnetism had been viewed as unrelated phenomena. 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. 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. In the past, electrically charged objects were thought to produce two different, unrelated types of field associated with their charge property. 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. The way in which charges and currents interact with the electromagnetic field is described by Maxwells 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. The field can be viewed as the combination of an electric field and a magnetic field. It is one of the four fundamental forces of nature the others are gravitation, weak interaction and strong interaction. The electromagnetic field extends indefinitely throughout space and describes the electromagnetic interaction. It affects the behavior of charged objects in the vicinity of the field. An electromagnetic field also EMF or EM field is a physical field produced by electrically charged objects.
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