Magnetism and Electromagnetism - Magnetism

Question 1

which magnets repel?

Answer 1

like charges (north and north or south and south)

Question 2

which magnets attract?

Answer 2

opposite charges (north and south)

Question 3

what are magnetically hard materials?

Answer 3

materials which retain their magnetism once magnetised

Question 4

what are magnetically soft materials?

Answer 4

magnetic materials that loose their magnetism once they are no longer exposed to a magnetic field

Question 5

what is a magnetic field?

Answer 5

the reigion of space around every magnet where we can detect magnetism

Question 6

what direction do magnetic field lines point?

Answer 6

from north to south

Question 7

when is magnetism induced?

Answer 7

• when magnetic materials are bought near or touch the pole of a strong or permanent magnet, they become magnets
• this magnetic character is induced in the objects and it is removed when the permanent magnet is removed
• this is a temporary magnet

Question 8

how would you investigate the magnetic field pattern for a permanent bar magnet and between two bar magnets?

Answer 8

• place your bar magnet in the centre of the next page and draw around it
• place a compass at one pole of the bar magnet.
• draw a ‘dot’ to show there the compass is pointing
• move the compass so the opposite end of the needle is pointing to the dot and repeat
• repeat from different points on the pole of the magnet
• join up your dots to create the field line plots

Question 9

how would you produce a uniform magnetic field?

Answer 9

• a uniform magnetic field is comprised of straight, parallel lines which are evenly spaced - - between two opposite charges on flat magnets, a uniform magnetic field is formed