state four magnetic materials

Answer explanation

iron,nickel,cobalt and steel.

what is a permanent magnet?

Answer explanation

a magnet that induces its own magnetic field.

what is a magnetic field?

Answer explanation

the area around a magnet where a force acts on a magnetic material

what happens when to like poles of magnets are brought together?

Answer explanation

they repel

what happens when to unlike poles of magnets are brought together?

Answer explanation

they attract

where is the magnetic field the stronngest around a magnet?

Answer explanation

at the poles

how does the strength of the magnetic field change as the distance from the magnet increases?

Answer explanation

it gets weaker

what is the direction of a magnetic field?

Answer explanation

away from the north seeking pole to the south seeking pole

how can the field around a bar magnet be plotted?

Answer explanation

use a plotting compass and a pencil, the plotting compass will align with the field lines of the magnet.

how can a compass be used as evidence for the earths magnetic field?

Answer explanation

when no other magnetic field is present the compass needle will always align with earths magnetic field.