If you consider a current carrying conductor, every instant an electron enters the conductor, another electron will be leaving the conductor. Thus, the current carrying conductor will not be charged (i.e, it would not have any net positive or negative charge). Remember dipole has zero net charge, but it does have electric field around it. So, if net charge is zero, it doesn't mean there is no electric field.
It is important to notice that, if assume only electrons to be moving, and kernels (positive nuclei) to be static, magnetic field will be produced only due to electrons.
The speed at which energy or signals travel down a conductor is actually the speed of the electromagnetic wave, not the movement of electrons (this is an modified statement extracted from wiki encyclopedia-speed of electricity).
Does it mean that electric field and magnetic field exists around the current carrying conductor?
Does it mean that only magnetic field exists around the current carrying conductor?
By the discussion until now (2/11/2013), I have found difference in answers with respect to AC and DC. So, from here on wards, I want the question to be discussed on both AC and DC. Every one are suggested to update their answers with respect to both the cases (AC and DC).
- Relativistic electromagnetism-Wiki provides you an idea about fields around a current carrying conductor, with respect to different frame of reference.
- I went through quite similar question Does a current carrying wire produce electric field outside? . I found that first question was assuming electric field to be existing around the current carrying conductor, and the second answer was assuming electric field to be not existing around current carrying conductor.
- I went through the link: propagationtime.pdf, it expresses the presence of both electric and magnetic field around a current carrying conductor.
- I took a look on this question, Confusion between Electric field and Magnetic field of a charged particle., it makes a clear attempt to say that, there is no electric field around a current carrying conductor.