P7- magnets & magnetic fields Flashcards
what is a magnetic field?
area around a magnet where either magnets or magnetic materials experience a force
what are magnetic materials?
Iron, cobalt, steel, nickle
what is a permanent magnet?
always magnetic and produces it’s own magnetic field e.g bar magnet
what is an induced magnet? what happens when you take out of a magnetic field?
magnetic materials that can become magnet when placed in a magnetic field. when removed quickly loose their magnetism, stop producing their own magnetic field.
what is the strongest point on a magnet and why?
poles, as they are HIGH DENSE with magnetic field lines
where do compasses point when their not near a magnet?
North which is Earth’s south
what is evidence of the earth’s magnetic field?
birds migrate following the earth’s magnetic field lines
what is evidence of the earth’s magnetic field changing?
-birds migration
-patterns changing, basalts and old rocks found on ocean floor containing MAGNETIC ANOMALIES
