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6. an electromagnet needs to be ? connected to power

  • indirectly
  • directly

7. domains are often referred to as ?

  • needles
  • mini magnets within a block
  • dots

8. all magnets have a ? pole and a ? pole

  • south and west
  • east and west
  • north and south
  • north and west

9. what type of material should a core be in a simple electromagnet?

  • unmagnetic
  • magnetic
  • plastic

10. does and electromagnet have the same type of magnetic field as a bar magnet?

  • maybe
  • yes
  • no

11. what do you need to build an electromagnet? coil of wire, iron nail, wires, battery pack and what?

  • paper
  • switch
  • crocodile clips

12. electromagnets can be ? and ?

  • glass and rubber
  • increased and decreased
  • plastic and glass

13. what is the main difference between an electromagnet and a bar magnet?

  • a bar magnet can be in a circuit breaker
  • electromagnets can be turned on and off
  • you can increase an electromagnet's strength

14. what happens if in a simple circuit breaker, there is an electrical surge?

  • an iron contact connects to the magnet - breaking the circuit
  • nothing changes
  • the magnet moves

15. domains won't attract if they're not ?

  • lined up
  • magnetic
  • plastic

16. if you knock a metal block the ? get mixed up

  • domains
  • mini magnets
  • dots
  • needles