Magnetic field

A magnetic field is an invisible region of space where Subatomic particles and moving electrical charges experience magnetic force. Unlike a static Field (physics), magnetic fields arise from two sources: spinning electrons within atoms, and electric currents flowing through conductors.

Magnetic fields have both strength and direction—they're vectors—and can be visualized as flowing from a magnet's north pole to its south pole. Earth itself generates a planetary magnetic field, crucial for shielding us from solar radiation and enabling Navigation.

The relationship between electricity and magnetism—revealed by Faraday's law—powers most modern technology: electric motors spin within magnetic fields, generators convert mechanical motion into current, and Measurement instruments like oscilloscopes rely on electron beams bent by carefully shaped fields.

In particle physics labs like CERN, powerful magnetic fields bend the paths of Subatomic particles, allowing physicists to identify and study them. Even in biology, magnetic fields influence cellular behavior and animal navigation. At extreme temperatures near Absolute zero, certain materials exhibit superconductivity, expelling magnetic fields entirely—a phenomenon still being explored by String theory researchers and practical engineers alike.

Related

Electromagnetism, Field (mathematics), Earth's magnetosphere, Electric current, Ferromagnetism