Electric field, E:

$\overline{){\mathbf{E}}{\mathbf{=}}{\mathbf{\rho}}{\mathbf{J}}}$

Resistivity, ρ:

$\overline{){\mathbf{\rho}}{\mathbf{=}}\frac{\mathbf{E}}{\mathbf{J}}}$

Current density, J:

$\overline{){\mathbf{J}}{\mathbf{=}}\frac{\mathbf{I}}{\mathbf{A}}}$

A 0.0075 v/m electric field creates a 3.9 mA current in a 1.0 mm diameter wire. What material is the wire made of?

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