Describe the interactions between magnets and their poles, magnets and magnetic materials and nonmagnetic materials.I dont really get it
Magnets are 'magnetic' because of the magnetic field that such objects produce. In a magnetic object, filed lines (imaginary lines that represent the surrounding magnetic field) are drawn from the North pole of a magnet to the South pole. The strength of a magnetic field decreases with distance from the poles. When two magnets are brought near one another, you will notice that they will attract one another when opposite poles are facing one another (meaning one magnet's North pole is facing another magnet's South pole). When two like poles are brought together, the magnets repel one another. When you bring a magnet near another metallic surface (fridge), this same behaviour is observed. Magnets align the particles on the surface parallel to one another, effectively creating another temporary magnet. The two surfaces will attract one another only when the poles in contact are opposite one another. Non-magnetic objects show no such display of a linear, parallel arrangement of particles (they are randomly dispersed, showing no pattern). Naturally, these objects show no behaviour of being magnetic when a magnet is brought near the surface. A cool idea: consider an MRI machine that doctors use. This machine is basically a giant magnetic field. When humans lay down in these machines, the magnetic field is so strong that it aligns all the protons in the human body parallel with one another. Of course, the Earth is the largest magnet we'll ever experience because of the metallic core. This does not, however, mean that it is the strongest. An MRI machine has a magnetic field that is far stronger than that of the Earth. I hope this is insightful for you.
