Displacement Current in a Wire A long, straight, copper wire

Displacement Current in a Wire A long, straight, copper wire with a circular cross-sectional area of 2.1 mm2 carries a current of16 A. The resistivity of the material is 2.0 X 10-8Ω ∙ m.
(a) What is the uniform electric field in the material?
(b) If the current is changing at the rate of 4000 A/s, at what rate is the electric field in the material changing?
(c) What is the displacement current density in the material in part?

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