The resistivity at 20∘C for four conducting materials is given below:
Material P: 1.7×10−8Ωm
Material Q: 6.8×10−7Ωm
Material R: 4.5×10−6Ωm
Material S: 2.5×10−8Ωm
Answer the following:
(i) Calculate the electrical conductivity of each material.
(ii) Arrange the four materials in descending order of conductivity.
(iii) An electrician must choose one of these materials for household wiring. Identify the most suitable material from your list in part (ii) and justify your choice on the basis of its calculated conductivity.