ETA Electronics Exam Practice 2025 – Full Prep Guide

When an electrical direct current (DC) flows through a wire, it generates a magnetic field around the wire. This phenomenon is described by Ampère's Law, which explains how electric currents produce magnetic fields. The direction of the magnetic field generated is perpendicular to the direction of the current flow, and its strength depends on the amount of current flowing through the wire.

This principle forms the basis for many electrical devices, such as electromagnets, where coils of wire carrying a current can create a significant and controlled magnetic field. This relationship between electricity and magnetism is one of the fundamental concepts in electromagnetism and is crucial for understanding how various electronic components operate.

Understanding this concept clarifies why the creation of a magnetic field is the most relevant answer in the context of the question. The other options reflect aspects of electrical behavior but do not directly address the specific relationship between DC current and magnetic fields.