In the link: that I found here 5 minutes ago ( thanks for the link ) there are two drawings: the first and the second. In the first the link explains that there is a magnetic field, because the - charges are moving. In the second the link explains that there is not a magnetic field, although the + charges are moving. What I see is that the two drawings are completely symmetrical -> if there is a B field in the first there must be a B field in the second. To make the question simpler, forget the + charge that is outside the wire. Focus in the + and - charges in the wire and the B field. Do you agree with me?