1) What is a magnetic field? a) An area within the magnet where magnetic force is felt b) An area around the magnet where magnetic force is felt c) An area where objects become magnetic d) An area where magnets can be found 2) How can you show the magnetic field of a magnet? a) You can put it under a microscope b) You can X-ray it c) You can scatter iron filings over it d) You can use a small compass to draw the lines 3) Which part of the compass needle would be attracted to the South pole of a magnet? a) The North pole b) The South Pole c) The pivot 4) Which of these is a magnetic metal? a) Iron b) Copper c) Nickel d) Magnesium e) Manganese f) Cobalt 5) Which of these would increase the strength of an electromagnet? a) Making sure the wire is properly insulated b) Adding more coils c) Wrapping it around a plastic core d) Increasing the resistance e) Increasing the voltage f) Wrapping it around an iron core 6) Why are electromagnets used in scrapyards? a) They are portable b) They are cheap c) They can be switched off d) They are easy to use 7) Where is the Earth's magnetic South pole? a) At the geographical North pole b) At the geographical South pole c) It doesn't have one 8) You are planning to investigate how the number of coils on an electromagnet affects its strength. What is the independent variable? a) The voltage b) How many paperclips it can pick up c) The material used for the core d) The number of coils 9) You are planning to investigate how the number of coils on an electromagnet affects its strength. What is the dependent variable? a) The voltage b) How many paperclips it can pick up c) The material used for the core d) The number of coils 10) You are planning to investigate how the number of coils on an electromagnet affects its strength. What are the control variables? a) The voltage b) How many paperclips it can pick up c) The material used for the core d) The number of coils 11) What is the relationship shown in this graph? a) As the number of drawing pins increased, the number of coils increased b) As the number of coils increased, the number of drawing pins attracted increased c) As more drawing pins were added, the magnetic field became weaker d) As the voltage increased, the number of drawing pins increased 12) What happens to the circuit when the switch is pressed? a) The armature will move towards the magnet, breaking the circuit b) The bell will ring once c) The electromagnet will be magnetic until the switch is pressed again d) The bell will ring repeatedly as the circuit is broken and then remade

Magnetic Field Quiz

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