A copper wire of cross-section carries a current of

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Problem

A copper wire of cross-section

1\,\text{mm}^2

carries a current of

2\,\text{A}

. If the number density of free electrons in copper is

8\times10^{28}\,\text{m}^{-3}

, calculate the drift velocity of electrons in the wire. (a)

1.3\times10^{-3}\,\text{m\,s}^{-1}

(b)

8.0\times10^{-5}\,\text{m\,s}^{-1}

(c)

1.6\times10^{-4}\,\text{m\,s}^{-1}

(d)

1.6\times10^{-5}\,\text{m\,s}^{-1}