Electromagnetism is the branch of physics that studies the relationship between electricity and magnetism. It is a fundamental force of nature that plays a crucial role in various aspects of everyday life.

One of the key properties of electromagnetism is that an electric current produces a magnetic field. Let's consider a simple example:

Imagine a wire carrying a current. Around the wire, a magnetic field is created, with the magnetic field lines forming concentric circles centered at the wire. This magnetic field can be detected using a compass needle, which will align itself with the magnetic field lines.

This phenomenon has numerous practical applications, such as electromagnets used in cranes and speakers. Electromagnets, consisting of a coil of wire wrapped around a magnetic core, can generate a strong magnetic field when an electric current passes through the wire. This allows them to lift heavy objects or produce sound vibrations by interacting with permanent magnets.