News tagged with electromagnetic field
'Dark plasmons' transmit energy
Microscopic channels of gold nanoparticles have the ability to transmit electromagnetic energy that starts as light and propagates via "dark plasmons," according to researchers at Rice University.
Feb 09, 2012 |
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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 |
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Solar power development in US Southwest could threaten wildlife
Government agencies are considering scores of applications to develop utility-scale solar power installations in the desert Southwest of the United States, but too little is known to judge their likely effects on wildlife, ...
Dec 09, 2011 |
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Magnetic treatment improves stroke patients' ability to communicate
(Medical Xpress) -- Magnetic stimulation of the brain could help improve language skills of stroke survivors with aphasia, according to research by The University of Queensland.
Medicine & Health / Neuroscience
Nov 15, 2011 |
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Millisecond pulsar in spin mode
Astronomers have tracked down the first gamma-ray pulsar in a globular cluster of stars. It is around 27,000 light years away and thus also holds the distance record in this class of objects. Moreover, its ...
Nov 03, 2011 |
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Biggest ever study shows no link between mobile phone use and tumors
There is no link between long-term use of mobile phones and tumours of the brain or central nervous system, finds new research published in the British Medical Journal today.
Oct 21, 2011 |
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Suspects in the quenching of star formation exonerated
Supermassive black holes millions to billions times the mass of our Sun lie at the heart of most, maybe all large galaxies. Some of these power brilliantly luminous, rapidly growing objects called active galactic nuclei that ...
Oct 11, 2011 |
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Mobile phone electromagnetic field affects local glucose metabolism in the human brain
Recent PET-measurements in Turku, Finland, show that the GSM mobile phone electromagnetic field suppresses glucose metabolism in temporoparietal and anterior temporal areas of the hemisphere next to the antenna.
Sep 15, 2011 |
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Children and adolescent mobile phone users at no greater risk of brain cancer than non-users
Children and adolescents who use mobile phones are not at a statistically significant increased risk of brain cancer compared to their peers who do not use mobile phones, according to a study published July 27 in the Journal of ...
Jul 27, 2011 |
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Mobile phone derived electromagnetic fields can disturb learning
High frequency non-ionizing radiation, emitted by mobile phones, is redundantly matter of discussions. The effects of high frequency electromagnetic fields derived from mobile phones have been discussed since the 1950s. Neuroscientists ...
Medicine & Health / Neuroscience
Jun 30, 2011 |
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Worry, resignation on potential cellphone cancer link
A World Health Organization warning of increased brain cancer risk for cellular phone users had many Americans alarmed Wednesday but resigned to needing the devices to do their jobs. ...
Jun 01, 2011 |
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Industry disputes report on cell phone cancer link
A global wireless industry group Thursday disputed the significance of a report released by a UN health organization citing a potential cancer link from use of mobile phones. ...
May 31, 2011 |
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Cell phones may be contributing to the honeybee population decline
(PhysOrg.com) -- In a new study published in Apidologie, Lausanne researcher and bee specialist Daniel Favre shares his findings of cell phones electromagnetic fields and their effects on the honeybee popula ...
May 18, 2011 |
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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 |
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Physicists move closer to efficient single-photon sources
A team of physicists in the United Kingdom has taken a giant step toward realizing efficient single-photon sources, which are expected to enable much-coveted completely secure optical communications, also known as "quantum ...
Mar 16, 2011 |
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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.
