Origin of magnetism
Examples from the Web for magnetism
Contemporary Examples of magnetism
The powerful forces of gravity and magnetism channel matter into huge flattened spinning platters known as accretion disks.The Black Hole Tango
Matthew R. Francis
November 24, 2014
All-American, with just enough sex appeal to maintain the magnetism.Are We in the Midst of a Kevin Costner Comeback?
January 28, 2014
We were all just blown away by his charisma and magnetism and his funniness.Joel Kinnaman: ‘The Killing’s’ Scene-Stealer
May 25, 2012
The way Melon gets around the line at registration is particularly ingenious, thanks to the magnetism of The Boss.Best ‘First Day of School’ Movies
September 5, 2011
“You find yourself prey to his magnetism,” said someone who worked closely with him.The Nice Guy Who Finishes First
August 31, 2010
Historical Examples of magnetism
In the unlimited power of her magnetism, what a trifle she had asked of him!Thoroughbreds
W. A. Fraser
They felt his magnetism, like the hum when you pass a power station.The Adventurer
Cyril M. Kornbluth
They ascribed it to some change in the magnetism of the iron shell and disk.
The steel behaves as if it were isolated from its own magnetism.
If magnetism be an antecedent factor, magnetism may be its product.The Machinery of the Universe
Amos Emerson Dolbear
A Closer Look: Magnetism is intimately linked with electricity, in that a magnetic field is established whenever electric charges are in motion, as in the flow of electrons in a wire, or the movement of electrons around an atomic nucleus. In atoms, this invisible field consists of closed loops called lines of force that surround and run through the atom. Magnetic regions where lines of force come together densely are called north and south poles. In substances in which the magnetic fields of each atom are aligned, the magnetic field causes the entire substance to act like single magnet-with north and south poles and a surrounding magnetic field. Permanent magnets are made of substances that retain this alignment. If a magnet is cut in two, each piece becomes a separate magnet with two poles. A coil of wire wrapped around an iron core can be made magnetic by running electric current through it; the looping electrons then create a magnetic field in just the same way as the spinning electrons in individual atoms. As long as current flows, the coil remains magnetized. Such magnets, called electromagnets, are used in many devices such as doorbells and switches. The connection between electric and magnetic fields is not one of cause and effect, however. Einstein showed that both the magnetic and electric fields are part of a single electromagnetic field, described by a single mathematical object called a tensor. Observers in different reference frames will not observe the same separate values for electric and magnetic fields, but will observe identical electromagnetic tensors. Whether or not magnetic monopoles (elementary particles carrying an isolated north or south magnetic charge, analogous to positive or negative electric charge) actually exist remains unknown; though they are predicted by some theories, none have been detected.