A student needs to find the diameter of a wire. The wire is narrower than one division on her ruler. She winds the wire neatly and forms 12 turns as shown in Fig. 2.1.
The student works out the density of the metal used for the wire. She bends part of the wire into a compact shape as shown in Fig. 2.2. She then lowers this small wire shape into a measuring cylinder of water. The measuring cylinder stands on an electric balance. This arrangement is shown in Fig. 2.3.
(a)[3]
Describe how she can use her ruler to determine the diameter of the wire accurately. You may annotate Fig. 2.1 as part of your answer.
(b(i))[1]
Using the information in Fig. 2.3, calculate the mass of the wire.
(b(ii))[2]
Using the information in Fig. 2.3, calculate the volume of the wire.
(c)[3]
Using this information, calculate the density of this wire.
Worked solution & mark scheme
This 9-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Find the total width of n loops with a ruler” …