(a(i))[1]
On Fig. 7.1, place the magnetic poles on the bar magnet.
(a(ii))[3]
Paper is placed beneath the magnet. Describe how the compass is used to plot the magnetic field line that goes from one pole to the other and through P.
(a(iii))[1]
Describe how the compass in Fig. 7.1 is used to find the direction of the magnetic field at P.
(b(i))[2]
Explain why the magnet’s movement causes a current to be produced.
(b(ii))[1]
Describe how the magnet moves to produce an a.c. of frequency $0.50\,\text{Hz}$.
(b(iii))[1]
Describe how the centre-zero ammeter indicates that the current is a.c. rather than d.c. (direct current).
(b(iv))[1]
Explain why a higher frequency of the a.c. produced also leads to a larger magnitude (size) of the a.c. produced.