(a)[1]
Suggest an appropriate material for the bar.
(b(i))[3]
On Fig. 7.2, draw at least six field lines to show the pattern and direction of the magnetic field around the bar.
(b(ii))[3]
Explain what happens to the magnetic field around the bar and state how the pattern of field lines representing the field changes.
(c)[3]
Explain what happens in the wires of the square coil.