In the study of electromagnetism, an important relationship exists between magnetic fields and electric currents. This relationship helps explain various phenomena and finds applications in many devices we use every day.

Explaining the Relationship: When an electric current flows through a conductor, such as a wire, it creates a magnetic field around it. Conversely, when a magnetic field changes or moves, it can induce an electric current in a nearby conductor.

Examples of Magnetic Fields Produced by Currents: A simple example is a straight wire carrying a current. Using the right-hand rule, we can determine the direction of the magnetic field generated around the wire. If we wrap the wire into a coil, the resulting magnetic field becomes even stronger, as seen in solenoids commonly found in doorbells and electromagnetic locks.

Applications of Magnetic Fields and Electric Currents: Understanding this relationship has led to the development of various devices and technologies. Electric motors, for instance, utilize the interaction between magnetic fields and electric currents to produce rotational motion. Similarly, transformers use electromagnetic induction to change the voltage of alternating current, enabling efficient transmission of electricity across long distances.