wire P r2 R A hollow pipe and a current carrying wire outside of it. Drawing not to scale. The figure above shows a long hollow pipe centred at the origin, with outside radius R carrying a uniform current Io into the page. An infinitely long, straight wire runs parallel to the pipe at a distance R+rı +r2 from its center. 8. Let ri = 2R, r2 = R. Calculate the magnitude and direction of the current in the wire that would cause the H field at P to have the same magnitude, but opposite direction, as the resultant field at the centre of the pipe. Verify explicitly your solution by showing that, with your Iw, Ħ(r2) = –Ħ(0).

wire P r2 R A hollow pipe and a current carrying wire outside of it. Drawing not to scale. The figure above shows a long hollow pipe centred at the origin, with outside radius R carrying a uniform current Io into the page. An infinitely long, straight wire runs parallel to the pipe at a distance R+rı +r2 from its center. 8. Let ri = 2R, r2 = R. Calculate the magnitude and direction of the current in the wire that would cause the H field at P to have the same magnitude, but opposite direction, as the resultant field at the centre of the pipe. Verify explicitly your solution by showing that, with your Iw, Ħ(r2) = –Ħ(0).