A straight, cylindrical wire lying along the x axis has a length of 0.500 m and a diameter of 0.2 mm. It is made of a material described by Ohm’s law with a resistivity of rho = 4.00 x 10−8 Ω· m. Assume a potential of 4.00 V is maintained at the left end of the wire at x = 0. Also assume V=0.0 at x = 0.5 m. Find (a) the magnitude and direction of the electric field in the wire, (10 pt) (b) the resistance of the wire, (5 pt) (c) the magnitude and direction of the current in the wire, (5 pt) and (d) the current density in the wire. (5 pt)