A magnet has two ____ which we call North and South. Magnets have an invisible force ____ around them. We can draw ____ with arrows to show the shape and direction of the field. The arrows always point away from the ____ pole and towards the ____ pole. The opposite poles of two magnets will ____, while the same poles of two magnets will ____. When we pass an electric current through a wire, a ____ field is produced. This shows that electricity and magnetism are closely linked, and we call this effect ____. Since the magnetic field goes around the wire, we can make it stronger by looping the wire into a coil, which we call a ____. We can strengthen the electromagnet further by adding an ____ core, or by adding more ____ of wire to the coil, or by increasing the ____ through the wire.

Magnetism and electromagnetism

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