7.4 FOR BROTHER OUSAMMA

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

Resumo de Recurso

	Criado por Muhammad Imran quase 7 anos atrás