Physics

Problem

A tungsten wire (

\rho = 5.6\times10^{-8}\,\Omega\!\cdot\!\text{m}

) with a diameter of

0.20\,\text{mm}

is to be used as a resistor in a circuit powered by a

6.0\,\text{V}

ideal battery. If the desired steady current is

2.0\,\text{A}

, approximately what length of wire is required? a)

0.54\,\text{m}

1.7\,\text{m}

0.17\,\text{m}

6.7\,\text{m}