In magnets, there are many rules to need to know. First magnets run from north to south outside the magnet and south to north inside the magnet. Also, magnetic field lines show the flow of these electrons and how they interact with other magnets around. When two magnets are close to each other with both of their closest sides the same, the magnets repel each other and magnet field lines shown in between the magnets are seen repelling away from each other. Also, when two magnets are close to each other with their closest sides being opposite, they attract, which is shown with magnetic field lines. Overall, by using these need to knows, you can determine many question with magnets.