To measure this local field strength, the first item needed is a working compass. With the compass aligned to north, a magnet is placed with its poles aligned at a right angle to the compass.

The emergence of a mysterious area in the South Atlantic where the geomagnetic field strength is decreasing rapidly, has led to speculation that Earth is heading towards a magnetic polarity reversal.

Earth's magnetic field dramatically flipped roughly 41,000 years ago. We can now experience this epic upheaval, thanks to a ...

Depending on the object's shape, its centre of mass can be inside or outside it. Gravitational field strength (g) is measured in newtons per kilogram (N/kg). The Earth's gravitational field ...

(Courtesy: Juan Eugenio Iglesias) Portable, low-field-strength MRI systems have the potential to transform neuroimaging – provided that their low spatial resolution and low signal-to-noise (SNR) ratio ...