Flashcards
7.4 FOR BROTHER OUSAMMA
Flashcards do conjunto (20)
- 1what materials do magnets attract?iron, cobalt and nickel.
- 2how can a magnets strength be determined?you can use a compass or sprinkling iron fillings around the magnet.
- 3what do magnetic fields do?*show direction of compass
*run from north to south
*don't cross
*strong when bundled together
*weak when further apart - 4what 2 poles repel each other?south and south and north and north.
- 5which 2 poles attract?south and north.
- 6what are the magnetic particles in a metal?domains.
- 7in a piece of magnetized iron which way do domains point?the same direction.
- 8in a piece of unmagnetized iron which way do domains point?random directions.
- 9whats a temporary magnet?when it acts like a magnet for a short period of time.
- 10how can permanent magnets be made?hitting or heating the medal to keep domains in same area.
- 11whats an electromagnet?much stronger magnetic field.
- 12does Earth have a magnetic field?yes.
- 13where does an electrostatic force act?within an electric field.
- 14what is an atom?everything is made of small particles called atoms.
- 15what is an atom made of?proton, neutrons and electrons.
- 16what is static electricity?the build up of charge.
- 17what is an insulator?when materials build up charge when rubbed with other substances.
- 18what is a conductor?when metallic objects don't build up charge.
- 19when does static electricity occur?when an object becomes charged.
- 20what can magnets be used for everyday?drills, hairdryers, credit cards, speakers MRI scans etc.