A straight cylindrical wire lying along the x axis has a length of 0.500 m and a diameter of 0.200 mm. It is made of a material that obeys Ohm’s law with a resistivity of o = 4.00 x 10-8 ‘(m. Assume that a potential of 4.00 V is maintained at x = 0, and that V " 0 at x = 0.500 m. Find, (a) The electric field E in the wire,, (b) The resistance of the wire,, (c) The electric current in the wire, and, (d) The current density J in the wire. Express vectors in vector notation., (e) Show that E = p J.

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