Because magnetism relies on the movement of electrons, the negative forces in two south poles will never be attracted to each other In the same way, the
Many electromagnets also have an iron core to make the magnetic field screw loses most of its magnetic force, and the metallic items it attracted before
When the right kind of metal is inside the magnetic field, the magnet attracts it Permanent magnets always have a magnetic field Magnets on your refrigerator
Knowledge Organiser KEY WORDS/IDEAS TO REMEMBER Attract Repel Induced magnet Permanent magnet Poles Magnetic field Electromagnet Solenoid Compass
A magnet has two poles, a north and a south pole • North poles attract south poles The electromagnet attracts the iron armature
Naturally occuring magnetite, one of iron oxides, showed magnetic properties and it was used to build a navigational device compass Compass is a small magnet
Until 1820, magnetism was not well understood Its only prac- tical use was in the compass Actually, the Earth behaves like a huge magnet Its magnetic South
Just like the permanent magnet, the electromagnet has a north and a south pole, and it attracts only objects made of iron or that have an iron content
For example, if you have two bar magnets with their ends marked "north" and "south," the north end of one magnet will attract the south end of the other
Keywords/concepts: Magnets, compass, electromagnet, permanent magnet, together, while it takes effort to remove attracting poles
3 Which poles attract each other? 4 Is magnetism a contact or non-contact force? 5 What does a permanent magnet do that an electromagnet doesn't?
Electromagnets Magnetism Strand e) simple electromagnets and magnetism opposite magnetic poles attract, and/or that similar poles repel each other
How does the size and strength of a magnet affect its ability to push or pull? Magnets and electromagnets attract each other when unlike poles are near
Magnets attract iron, nickel, and cobalt Activity: What is a Magnet? MATERIALS: Magnets >