Health

Probing Question: Are cell phones safe?

An estimated 5 billion people around the world hold cell phones up to their ears nearly every day. Many of them wonder if they might be receiving more than news from people on the other end. Are mobile phones dosing us with ...

Medical research

Study uncovers how electromagnetic fields can amplify pain

For years, retired Maj. David Underwood has noticed that whenever he drove under power lines and around other electromagnetic fields, he would feel a buzz in what remained of his arm. When traveling by car through Texas' ...

Health

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.

Psychology & Psychiatry

Media health warnings trigger symptoms from sham exposure

(HealthDay)—Individuals who watched a news report about the adverse health effects of exposure to electromagnetic fields (EMF) were more likely to experience symptoms after a 15-minute sham exposure to a WiFi signal than ...

page 1 from 3

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.

This text uses material from Wikipedia, licensed under CC BY-SA