What is the relationship between electromagnetism and electric current?

The correct answer highlights a fundamental principle of electromagnetism: when an electric current flows through a conductor, it generates a magnetic field around that conductor. This phenomenon is governed by Ampère's circuital law, which relates magnetic fields to the electric currents that produce them. In practical terms, this principle is utilized in many electrical devices, such as electromagnets, transformers, and motors, where the flow of current is essential to create the desired magnetic fields for their operation.

The other options do not accurately reflect the established principles of electromagnetism. The claim that electric current has no effect on magnetic fields contradicts the foundational concepts of how electric and magnetic phenomena interact. Stating that only high voltages create magnetic fields disregards the fact that magnetic fields can arise from any level of current, as long as it is present. Lastly, while it is true that magnetic fields can exist independently (such as in the case of permanent magnets), the intrinsic relationship between current and magnetism is specifically demonstrated through the action of current creating a magnetic field.