(a)[1]
From the list below, identify which metals can be permanently magnetised. Put a tick (✓) in the box beside each correct metal: aluminium, copper, steel, tungsten.
(b)[2]
Describe the test that you would do to check whether both rods are permanent magnets.
(c(i))[3]
Describe how to construct an electromagnet. You may use a labelled diagram to support your answer.
(c(ii))[2]
Suggest two factors that influence the strength of the magnetic field of an electromagnet.