A composite straight wire consists of two segments joined end-to-end, each 40cm long. Segment 1 is aluminium of diameter 1.2mm and resistivity 2.7×10−8Ωm. Segment 2 is manganin of diameter 0.60mm and resistivity 4.4×10−7Ωm.
(a) Calculate the resistance of Segment 1.
(b) Calculate the resistance of Segment 2.
(c) By comparing your answers to parts (a) and (b), comment on the suitability of each material for making standard resistors.