simple phenomena of magnetism Flashcards
what are the 2 poles of a magnet
north and south
what are examples of ferrous magnetic materials
iron and steel
what are non ferrous materials
non- magnetic materials eg: copper and aluminium
what is a hard and soft magnet
hard: retains its magnetism ( steel)
soft: loses its magnetism easily ( iron)
what are permenant magnets made of
steel
what is induced magnetism
a material is made into a magnet by its closeness to a magnetic material
how can a magnet me demagnetized
hitting it or heating
placing a magnet inside a coil,, using a ac current, then slowly remiving the magnet
what is a magnetic field
region where a pagnetic pole experiences a force
what is the only test for a magnet
repulsion
how to make a permenant magnet
place a steel rod insde a coil, use highh dc current for a time, leave steel inside then turn of current
how to increase the strength of a electro magnet
use a iron core
more current
more turns of wire
what is iron in terms of magnetism
temporary soft magnet
what are examples of electromagnets
electric bells, loudspeekers, some microphones
