A magnetic field is invisible, but it can be detected using a magnetic compass. A compass contains a small bar magnet on a pivot so that it can rotate. The compass needle points in the direction ...

How does fMRI work? Created with Sketch. In MRI, a person lays within a magnetic field produced by a tube-shaped machine. An MRI system makes use of the magnetic properties of atoms within the ...

A survey of high-speed electron flow observed by NASA satellites in the Earth’s magnetotail is presented and related to the process of magnetic field line reconnection and particle acceleration.