The 10 km long copper conductor with a diameter of 2 cm has a current density of J-8 A/mm2. Accordingly, calculate the electric field (E), the drift velocity of the electrons (Ve), the magnetic field (B) 50 cm away from the wire and the DC resistance (Rcu) on the conductor (pe=3.210-3 m/Vs, ocu=5 ,80x107 S/m).