When you measured the different magnets’ force on the Newton meter in that activity, you measured the strength of the magnetic field.

A magnetic field is the area around the magnet where the force acts.

This force is invisible, but very powerful.

Our Earth is a giant magnet with an invisible field around it. See how its fields are similar to that of a simple bar magnet? Earth has a north pole and a south pole, just like the bar magnet.