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A thin cylindrical wire carries a current of 1.67 Amperes and has a diameter of 1.02...

A thin cylindrical wire carries a current of 1.67 Amperes and has a diameter of 1.02

mm. The resistivity of the material of the wire is 1.72 x 10 -​ 9​ ​Ω​ m.
(a) What is the magnitude of the current density in the wire?
(b) What is the magnitude of the electric field in the wire?
(c) What is the potential difference between two points in the wire 50 m apart?

(d) What is the resistance of a 50 m length of this wire?

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