A magnetic pole is the part of a magnet that exerts the strongest force on other magnets or magnetic material, such as iron. For example, the poles of the bar magnet shown in Figure 20.2 are where the paper clips are concentrated.
ink, fluid or paste of various colours, but usually black or dark blue, used for writing and printing. It is composed of a pigment or dye dissolved or dispersed in a liquid called the vehicle.
In chemistry and physics, an element is a substance that cannot be broken down into simpler components by any non-nuclear chemical reaction. An element is uniquely determined by the number of protons in the nuclei of its atoms.