Magnetic Field

In this exhibit, it helps us to visualize magnetic field lines by observing the effect that the lines have on compasses. The magnet generates a magnetic field which extends to the area around the magnet. Magnetic fields affect a compass. A compass is built as a stand-alone sealed instrument with a magnetized needle turning freely on a nearly frictionless pivot point. It can be used to detect small magnetic field.
The exhibit identifies the magnetic field of a magnet by placing compasses at various locations around the bar magnet and observing where the compass needles point. As it goes closer to the magnet, the compass begins point more and more toward the magnet as a result of the force, or the magnetic field of the magnet. The compass needle aligns itself with the magnetic flux lines of the magnet.