A cylindrical copper wire of length and radius has resistivity

PHYSICS · Single correct · A Level · Physics · Electricity · Electricity

Problem

A cylindrical copper wire of length

2.0\,\text{m}

and radius

0.50\,\text{mm}

has resistivity

1.7\times10^{-8}\,\Omega\!\cdot\!\text{m}

. If a potential difference of

3.0\,\text{V}

is applied between its ends, what is the magnitude of the resulting current? (a)

6.9\,\text{A}

(b)

69\,\text{A}

(c)

0.69\,\text{A}

(d)

690\,\text{A}

Related theory

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