(a(i))[1]
On Fig. 5.1, add arrows to the field lines to indicate the direction of the magnetic field.
(a(ii))[1]
State the feature in Fig. 5.1 that shows the magnetic field strength at each end of the solenoid is smaller than at the centre.
(b)[2]
In (a), a Hall probe is positioned close to one end of the solenoid, as shown in Fig. 5.2. The Hall probe is rotated about the axis $XY$. State and explain why the magnitude of the Hall voltage changes.
(c(i))[2]
State Faraday’s law of electromagnetic induction in terms of magnetic flux linkage.
(c(ii))[3]
In (b), the Hall probe is replaced with a small coil of wire linked to a sensitive voltmeter. State three different ways in which an e.m.f. can be induced in the coil.