If shrunken down to micron size, a compass needle could wobble. (Courtesy: iStockphoto/tobias machhaus) A tiny magnetic needle just 10 μm long could be used to create a magnetic-field sensor that – if ...

A compass is a navigational tool that helps people find their direction using the earth's magnetic field. It contains a magnet that aligns itself with the earth's north pole to indicate the direction.

Compasses were the trusted companions of sailors, explorers, and travelers for centuries, offering a simple way to find north. A small magnetized needle is set on a tiny pivot, allowing it to move and ...