What do all current-carrying conductors create?

All current-carrying conductors produce both electrical and magnetic fields as a fundamental principle of electromagnetism. When an electric current flows through a conductor, it generates a magnetic field around it, whose direction can be determined using the right-hand rule. This is a result of the motion of charged particles (usually electrons) moving through the conductor.

In addition, the movement of these charges creates an electric field. The electric field exists due to the difference in electric potential, which drives the flow of current. Thus, any conductor that carries an electric current will simultaneously have both an electric field and a magnetic field associated with it.

The option that states both electrical and magnetic fields correctly captures this fundamental property of conductors when current flows through them, thereby reflecting the interconnected nature of electric and magnetic phenomena in physics, known as electromagnetism.