Physics P3 3.1 Electromagnets. 0.0 / 5 ? PhysicsElectromagnetismGCSEAQA Created by: Atlanta and JacobCreated on: 19-09-16 18:03 What are the ends of a magnet called? Magnetic poles, there is a north pole at one end and a south pole at the other. 1 of 17 What is the region around the magnet, in which a piece of iron or steel will be attracted to it, called? Its magnetic field. 2 of 17 What happens to iron filing that are placed near a magnet? They will form a pattern of lines that loop from one pole to the other, these are lines of force of magnetic field lines. 3 of 17 Where will a plotting compass placed in the magnetic field always point? Along a field line. 4 of 17 What happens if two magnets are brought close to each other with like poles together (north and north or south and south)? They will repel each other. 5 of 17 What happens if unlike poles of two magnets are brought close together (north and south or south and north)? They will attract each other. 6 of 17 What happens when a current flows through a wire? A magnetic field is produced around the wire. 7 of 17 How is an electromagnet made? By wrapping insulated wire around a piece of iron called the core, when a current flows through the wire the iron becomes strongly magnetised. 8 of 17 Why is an electromagnet very useful? Because the magnetism is temporary and can be controlled, when the current is switched of the iron loses its magnetism. 9 of 17 What are electromagnets used in? Devices such as scrapyard cranes, circuit breakers, electric bells and relays. 10 of 17 How does the force between two magnets work? Like poles repel and unlike poles attract. 11 of 17 What is a magnetic field line? The line along which a plotting compass points. 12 of 17 What does an electromagnet consist of? A coil of insulated wire wrapped round an iron core. 13 of 17 What is a magnetic field? The region around a magnet, in which a piece of iron or steel will be attracted to it. 14 of 17 What does an electromagnet consist of? An electromagnet consists of a piece of insulated wire wrapped around an iron core. 15 of 17 **LOOK UP THE MAGNETIC FIELD NEAR A BAR MAGNET** **LOOK UP A DIAGRAM OF A SIMPLE ELECTROMAGNET** 16 of 17 **IN THE EXAM YOU MAY BE GIVEN A DIAGRAM OF AN APPLIANCE THAT CONTAINS AN ELECTROMAGNET AND ASKED TO EXPLAIN HOW IT WORKS** ** 17 of 17
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