News tagged with electromagnetic field
Levitating magnet may yield new approach to clean energy
(PhysOrg.com) -- A new experiment that reproduces the magnetic fields of the Earth and other planets has yielded its first significant results. The findings confirm that its unique approach has some potential ...
Jan 24, 2010 |
4.7 / 5 (44) |
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Schrodinger's Cat Experiment Proposed
(PhysOrg.com) -- One of the classical problems in quantum mechanics concerns a man and his feline companion. The man has placed his cat in an opaque tank and is slowing pumping it full of poison. Now until ...
Sep 24, 2009 |
3.5 / 5 (46) |
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Radiation Review: Some People May be 'Allergic' to Cell Phones, Computers
(PhysOrg.com) -- How exactly does the radiation from electromagnetic fields (EMF) affect the human body? Is it possible that cell phones, computer monitors, TVs, and other electronic devices - which operate ...
Medicine & Health / Medical research
May 15, 2009 |
3.4 / 5 (38) |
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Controlling the interaction between light and matter
(PhysOrg.com) -- "One of the most exciting things about this is that it gives us nice, clean control over the interaction between light and matter," William Kelly tells PhysOrg.com. "Our technique has the potential to giv ...
Apr 30, 2010 |
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Magnetic vortex memory shows memory potential of nanodots
(PhysOrg.com) -- Using magnetic nanodots in the vortex state, researchers have designed a new kind of non-volatile memory that could offer increased speed and density for next-generation non-volatile random ...
Apr 21, 2010 |
4.9 / 5 (15) |
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Tiny nano-electromagnets turn a cloak of invisibility into a possibility
A team of researchers at the FOM institute AMOLF (The Netherlands) has succeeded for the first time in powering an energy transfer between nano-electromagnets with the magnetic field of light.
Dec 22, 2009 |
4.6 / 5 (15) |
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A galactic magnetic field in a lab bolsters astrophysical theory
Why is the universe magnetized? It's a question scientists have been asking for decades. Now, an international team of researchers including a University of Michigan professor have demonstrated that it could ...
Jan 25, 2012 |
4.9 / 5 (14) |
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When the speed of light depends on its direction
Light does not travel at the same speed in all directions under the effect of an electromagnetic field. Although predicted by theory, this counter-intuitive effect has for the first time been demonstrated ...
May 13, 2011 |
4.6 / 5 (14) |
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Sensor measures yoctonewton forces fast
(PhysOrg.com) -- Physicists at the National Institute of Standards and Technology have used a small crystal of ions (electrically charged atoms) to detect forces at the scale of yoctonewtons. Measurements ...
Sep 01, 2010 |
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Scientists discover giant Rydberg atom molecules
A group of University of Oklahoma researchers led by Dr. James P. Shaffer, Homer L. Dodge Department of Physics and Astronomy, have discovered giant Rydberg molecules with a bond as large as a red blood cell. Determining ...
Jun 24, 2009 |
4.5 / 5 (13) |
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Cell phone exposure may protect against and reverse Alzheimer's disease
The millions of people who spend hours every day on a cell phone may have a new excuse for yakking. A surprising new study in mice provides the first evidence that long-term exposure to electromagnetic waves ...
Medicine & Health / Medical research
Jan 06, 2010 |
4.5 / 5 (13) |
10
A New Cloaking Method: This is not a 'Star Trek' or 'Harry Potter' Story (w/ Video)
(PhysOrg.com) -- University of Utah mathematicians developed a new cloaking method, and it's unlikely to lead to invisibility cloaks like those used by Harry Potter or Romulan spaceships in "Star Trek." Instead, ...
Aug 17, 2009 |
4.4 / 5 (13) |
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Exotic material boosts electromagnetism safely
Using exotic man-made materials, scientists from Duke University and Boston College believe they can greatly enhance the forces of electromagnetism (EM), one of the four fundamental forces of nature, without ...
Feb 29, 2012 |
4.6 / 5 (12) |
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Ball lightning may sometimes be explained as hallucinations
(PhysOrg.com) -- Physicists in Austria have calculated the magnetic fields associated with certain types of lightning strikes are powerful enough to create hallucinations of hovering balls of light in nearby ...
May 13, 2010 |
3.2 / 5 (17) |
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Transformation optics make a U-turn for the better
(PhysOrg.com) -- Berkeley researchers have combined the scientific fields of transformation optics and plasmonics to demonstrate that with only moderate modifications of the dielectric component of a metamaterial, ...
Jul 01, 2010 |
4.9 / 5 (11) |
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Electromagnetic field
The electromagnetic 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, the weak interaction, and the strong interaction). The field propagates by electromagnetic radiation; in order of increasing energy (decreasing wavelength) electromagnetic radiation comprises: radio waves, microwaves, infrared, visible light, ultraviolet, X-rays, and gamma rays.
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, the electromagnetic field can be regarded as a smooth, continuous field, propagated in a wavelike manner; whereas, from a quantum mechanical perspective, the field is seen as quantised, being composed of individual particles.
For more information about Electromagnetic field, read the full article at
Wikipedia.
This text uses material from Wikipedia and is available under the GNU Free Documentation License.
