At room temperature, what is the strength of the electric field in a 12 gauge copper wire (diameter 2.05 mm) that is needed to cause a 4.70 a current to flow? use the resistivity at room temperature for copper rho = 1.72×10−8 ω⋅m.

Electric field will be

Explanation:

We have given diameter of the copper d = 2.05 mm

So radius

We know that area

Current is given as i = 4.7 A

So current density

Resistivity is given

We know that electric field is given by

car a and b are moving in opposite directions

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