This phenomenon is known as electromagnetism. Here's a breakdown:

* Electric current: The flow of charged particles (usually electrons) through a wire.

* Magnetic field: An invisible area around a magnet or a current-carrying wire where magnetic forces can be felt.

The strength of the magnetic field depends on the magnitude of the current and the shape of the wire. This principle is used in many technologies, including:

* Electromagnets: These are used in motors, generators, and magnetic resonance imaging (MRI) machines.

* Speakers: A changing current in a wire coil creates a changing magnetic field, which vibrates a diaphragm to produce sound.

* Electric motors: The interaction between a magnetic field and a current-carrying coil produces rotational force.