Physics

Problem

The resistivities of three substances at

20^{\circ}\text{C}

are: silver

1.6\times10^{-8}\,\Omega\,\text{m}

, nichrome

1.1\times10^{-6}\,\Omega\,\text{m}

, and iron

1.0\times10^{-7}\,\Omega\,\text{m}

. a. (i) Arrange the three substances in descending order of conductivity. b. (ii) Which of these would you choose for the heating element of an electric toaster?

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