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6. an electromagnet needs to be ? connected to power
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?
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