magnetism

Question 1

what direction to field lines always travel from

Answer 1

north to south

Question 2

what are the 3 magnetic materials

Answer 2

iron

nickel

cobalt

Question 3

what is the rule regarding field lines in magnetism

Answer 3

they never cross

always north to south

Question 4

how to demagnetise an object

Answer 4

hit it

heat it

expose to alternating external field )such as moving a magnet back and forth )

Question 5

properties of ‘soft iron’

Answer 5

easily magnetised and demagnetised

Question 6

properties of ‘hard iron’

Answer 6

not easily magnetised and demagnetised

Question 7

test to determine shape and direction of magnetic field

Answer 7

paper on magnet

iron filings on paper

use compass to show direction

Question 8

what is soft iron used in and what is an example of it

Answer 8

electromagnets

pure iron

Question 9

what is hard iron used in and what is an example of it

Answer 9

producing a bar magnet (permanent magnet)

steel

Question 10

where is field length strongest

Answer 10

at poles because field lines are close together