the.com/magnetic field
invisible lines that tell iron filings, compasses, and stars which way to lean.
means a region of space where magnetic forces act on moving charges and magnetic materials, described by direction and strength at every point.
from named from Magnesia, the greek region rich in lodestone, but the modern field concept comes from faraday, who literally imagined space filled with invisible lines of force.
earth's shielddeflects solar wind, saving the atmosphere from erosion
flips happenearth's poles reverse roughly every 200,000 to 300,000 years
no monopolesevery magnet found so far has two poles, never one
mri strengthhospital scanners use fields 50,000 times earth's own