(a(i))[1]
State all the materials that act as electrical insulators.
(a(ii))[1]
State one example of a material that is magnetic.
(b)[1]
Label the missing pole on magnet P and both poles on magnet Q on Fig. 9.1.
(c)[1]
State one further advantage of an electromagnet compared with a permanent magnet.
(d)[3]
Indicate which features will give the strongest electromagnet. Tick (✓) one box in each list.