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Magnetism Review What are the 2 ends of a rectangular magnet called? ? ? North and South Poles Name a material that magnets are attracted to. Iron, nickel, cobalt or rare earth metals. True or False. The strength of a magnetic field can be made stronger by placing two magnets together. True Draw a rectangular magnet and its magnetic field. What are the lines of force surrounding a permanent magnet called? Magnetic Field What does MRI stand for? Magnetic Resonance Imaging Name a practical use for magnets. Credit cards, speakers and microphones, junkyard electromagnet, electric motors, medicine, compass, magnetic levitation transport What is the name of a temporary magnet that is made by coiling a wire around an iron core and running electricity through the wire? Electromagnet What is the name of the area inside a magnet where all the electrons are lined up? Magnetic Domain What can you do to the number of wire coils to make an electromagnet stronger? Increase the number of coils What can you do to the current to make an electromagnet stronger? Increase the current When talking about magnets what word is the opposite of attract? Repel If you hang a magnet so it is free to swing and turn, what have you created? A compass True or False: An electromagnet is a temporary magnet. True. They can be turned off and on. True or False: You can demagnetize a permanent magnet by heating it or hitting it (really hard). True True or False: You can demagnetize a permanent magnet by heating it or hitting it (really hard). True