magnetism

what are the names of the two poles in a magnetic

North Pole

South Pole

what poles would be attracted and what poles would repel

N-N repel

S-S repel

N-S attract

define hard magnets

magnets that are hard to magnetise, when they are magnetised they stay magnetised for a very long time

for example steel

define soft magnets

magnets that are easy to magnetise, when they are magnetised they do not stay magnetised for a long time.

for example iron

define magnetic field

the region around a magnet where a force acts on another magnet or magnetic material.

waht do magnetic field lines show

direction of the magnetic field

strength of the magnetic field lines (closer lines means more stronger)

they never cross

define induced

when a magnetic material is magnetised temporarily becuase it is in a magnetic field

how would you investigate the magnetic field lines

place a magnet bar under piece of paper

put iron fillings onto the the paper

the fillings will align with the magnetic field lines

what is the pattern

lines go from North Pole to South Pole

the magnetic field is the strongest the poles

define uniform magnetic field

when the magnetic field is equal everywhere, it is shown by drawing straight parallel lines and are evenly spaced.

how would ou produce a uniform magnetic field

get two magnets, leave a gp next to them one side has to be north and the other one is south.