(a(i))[3]
Complete Fig. 4.1 by giving the name of an instrument that could be used to measure each of the quantities.
(a(ii))[1]
Explain why a set of values of $F$, each paired with a corresponding extension $e$, are measured.
(b)[2]
Explain how a set of readings for the quantities in Fig. 4.1 is used to determine the Young modulus of the metal. You do not need to give a numerical value for $E$.