Physics

Problem

Three conducting materials P, Q and R have resistivity values

2.0\times10^{-8}\;\Omega\,\text{m}

6.8\times10^{-7}\;\Omega\,\text{m}

and

1.6\times10^{-6}\;\Omega\,\text{m}

respectively. a. (i) Arrange the materials in increasing order of electrical conductivity. b. (ii) Which material would you recommend for making a

200\,\text{m}

long overhead transmission line? Give one reason for your choice. c. (iii) The selected material in part (ii) is drawn into a wire of cross-sectional area

3.0\times10^{-6}\;\text{m}^2

. Calculate the resistance offered by the entire length of this wire.

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