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Lecture 13 ELEC 3105 NEW
Lecture 13 ELEC 3105 NEW

... of repulsion is very weak (a hundred thousand times weaker than the ferromagnetic force of attraction). Water, the main component of grapes, is diamagnetic. When an electric charge moves, a magnetic field is created. Every electron is therefore a very tiny magnet, because electrons carry charge and ...
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... molten core. These currents are hundreds of miles wide and flow at thousands of miles per hour as the earth rotates. The powerful magnetic field passes out through the core of the earth, passes through the crust and enters space. This picture was created by a computer from a mathematical model, show ...
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On electromagnetic induction Contents

... 2. The first two - grouped under square brackets for underlining their common H ~ whose ~ · dl, mathematical and physical origin - come from the line integral l E value is controlled by Maxwell equation (2) through equation (5). Accordingly, their sum must be zero when the magnetic eld does not dep ...
< 1 ... 22 23 24 25 26 27 28 29 30 ... 115 >

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 vicinity of the field. The electromagnetic field extends indefinitely throughout space and describes the electromagnetic interaction. It is one of the four fundamental forces of nature (the others are gravitation, weak interaction and strong interaction).The field can be viewed as the combination of an electric field and a magnetic field. 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 way in which charges and currents interact with the electromagnetic field is described by Maxwell's equations and the Lorentz force law.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.
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