A straight, cylindrical wire lying along the x axis has a length of 0.72 m and a diameter of 0.78 mm. It is made of a material described by Ohm's law with a resistivity of ρ = 4.74 ✕ 10−8Ω· m. Assume a potential of 4.43 V is maintained at the left end of the wire at x = 0. Also assume V = 0 at x = 0.72 m. Find the current density (in A/m2) in the wire. Use scientific/exponential notation to represent your answer to this problem. Eg., -0.0001 can be written as 1.0e-4 or as 1.0E-4. Spaces are not allowed.

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Resistivity

Resistivity is a characteristic property of the conductor’s material that measures the extent to which the material opposes the flow of current. It is denoted by the Greek letter “rho”. Electrical resistivity, also known as specific resistance, depends on the nature of the material of the conductor and is unaffected by its dimensions.