magnetism (10)

Question 1

magnetic field weakens

Answer 1

as the distance from the object increases

Question 2

what results in a net magnetic field

Answer 2

in permanent magnets the domains move and align with the magnetic field

Question 3

objects that are ferromagnetic

Answer 3

can be magnetised, and once they ate it stays magnetised

Question 4

permanent magnets

Answer 4

has a pair of opposite poles
like poles repel
unlike poles attract

Question 5

magnetic field lines

Answer 5

imaginary and do not cross
3D lines
indicate the force on a north pole, thus always points away from the north pole
arrows on magnetic field lines show the direction of the magnetic field

Question 6

magnetosphere

Answer 6

the area or space around the earth dominated by the magnetic field of the earth

Question 7

what does the magnetosphere protect earth from

Answer 7

high speed ionised particles that tumble to the earth from the sun called solar wind

Question 8

flux

Answer 8

a measure of strength of the magnetic field

Question 9

ferromagnetic substance s

Answer 9

nickel, cobalt, iron

Question 10

11,5* is the angle of

Answer 10

deviation, the geographic north pole is 11,5* away from the direction of the magnetic north pole

Question 11

a compass

Answer 11

an instrument used to find the magnetic north pole

Question 12

how is an aurorae caused

Answer 12

when charged particles from the solar wind reach the earths magnetosphere they spiral along the magnetic field lines towards north and south pole