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A long, straight, copper wire with a circular cross-sectionalarea of 2.1mm2 carries a current of 16 A. Theresistivity of the material is 2.0 X 10-8 O m.

a) What is the uniform electric field in thematerial?

b) If the current is changing at the rate of 4000 A/s, at whatrate is the electric field in the material changing?

c) What is the displacement current density in the material inpart (b)?

d) If the current is changing as in part (b), what is themagnitude of the magnetic field 6.0cm from the center of the wire?Note that both the conduction current and the displacement currentshould be included in the calculation of B. Is the contributionfrom the displacement current significant?

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