How can we increase the strength of a bar magnet using a piece of steel? Why is it stronger? Find out here.

What happens to the magnetic field of a magnet in the presence of another material which is attracted to it? Why does this happen? [2:03]

A compass will align with the lines of force around a magnet. How could you do this in three dimensions? [0:29]

An experiment exploring the effect of a permanent magnet on a compass. What is going on? [1:05]