What Triggers a Compass?
A compass is an essential navigational tool used to find direction, whether on land or sea. It consists of a small magnetized needle that responds to the Earth’s magnetic field, always pointing towards the magnetic north. But what exactly triggers a compass to behave in this way?
Direct Answer
The short answer is the Earth’s magnetic field, which is caused by the movement of molten iron in the Earth’s outer core. The movement generates a strong magnetic field that extends to the Earth’s surface, including our own magnetic needle on a compass.
Underlying Forces
Forces acting on a magnet include attraction and repulsion between opposite and like poles respectively. On a compass, these forces are balanced and depend on the compass’ distance from the magnetic center and its magnetic declination (compass needle).
When you point a compass on a globe, its north-south orientation comes into contact with the magnetic Earth. Magnetic lines around our compass move the compass north (Magnetic south Pole towards). Earths Permanent magnetism field triggers this attraction, not another factor; we want, therefore; Earth-magnitised the only true orientation factor in most contexts of.
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