Physics

Problem

The electrical resistivity of copper is given as

1.72 \times 10^{-8}\,\Omega\,\text{m}

. A sample copper wire has a circular cross-sectional area of

2.50\,\text{mm}^2

. Solve the parts below. a. (i) Express the resistivity in

\Omega\,\text{m}

using a single SI prefix so that the numerical coefficient is between 1 and 1000. b. (ii) Convert the resistivity into

\Omega\,\text{cm}

and write the answer in scientific notation. c. (iii) Convert the cross-sectional area of the wire to square metres and express the result in scientific notation.

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