Any current circulating in a planar loop produces a magnetic moment whose magnitude is equal to the product of the current and the area of the loop. When any charged particle is rotating, it behaves like a current loop with a magnetic moment. For a...

In physics, astronomy, chemistry, and electrical engineering, the term magnetic moment of a system (such as a loop of electric current, a bar magnet, an electron, a molecule, or a planet) usually refers to its magnetic dipole moment, and is a measure of...

Pulsars AUSTIN, TEXAS Some of the weirdest objects in the galaxy are giving up more of their secrets WHEN a star goes bang, the result is a pulsar. The wave of radiation the star emits in its dying moments (when...

Long ago, in a part of Greece known as Magnesia, a very unusual rock was discovered Iron spears seemed to "magically" stick to this rock. In China, people discovered that when they floated a piece of this rock in water, it acted very...