Magnetism is a force of nature produced by moving electric charges. Sometimes these motions are microscopic and inside of a material known as magnets. Magnets, or the magnetic fields created by moving electric
A similar thing happens when a charged particle moves through a magnetic field, say, near a (permanent) bar magnet . The particle experiences force. But according to the theory of relativity, you can't say that the particle is moving and the magnet isn't. From the point of view of the...
Permanent magnets always have their magnetic force. induced magnets are ones that become temporarily magnetized when brought near a permanent magnet. For example, if a magnet is used to pick up a paper clip, the paper clip will become magnetized too, and it will be able to pick up another ...
In addition to current traveling through a wire, magnetism is produced by the spin magnetic moments ofelementary particles, such as electrons. Thus, all matter is magnetic to some degree because electrons orbiting an atomic nucleus produce a magnetic field. In the presence of an electric field, ...
The Sun will one day be about the size of Earth. After its red giant phase, the Sun will collapse. It will keep its enormous mass with the approximate volume of our planet. When this happens, it will have become a white dwarf.
Electrons might live forever. Scientists have estimated the minimum lifetime of the electron is about 6.6 × 1028 years – this is 66,000 ‘yottayears’. Since this is about 5 quintillion times the age of the Universe, even if electrons don’t live forever, they may as well do!
Earth’s atmosphere is composed of nitrogen (about 78%) and oxygen (about 21%), with small amounts of other gases. Earth’s magnetic field is created by its iron-nickel core. Our magnetic field protects the planet from harmful solar radiation. ...
Einstein liked to tell a story about when he was five years old and sick in bed how his father brought him a magnetic compass that was the first he�d ever seen. He was fascinated by the fact that the needle always pointed north, pulled by an invisible force. No matter how he twist...
to line up in the direction of the field. Magnetic fieldsforcemoving electrically charged particles in a circular or helical path. This force—exerted on electric currents in wires in a magnetic field—underlies the operation ofelectric motors. (For more information about magnetic fields,see...
Since the early 19th century, Earth's magnetic north pole has been creeping northward by more than 600 miles (1,100 kilometers), according to NASA scientists. The rate of movement has increased, with the pole migrating northward at about 40 miles (64 km) per year currently, compared with ...