Electric bell is an example of an Electromagnet.

Explanation:

An electric bell is a device that uses electricity to produce sound. It consists of a metal bell, an electromagnet, a hammer, and a power source.

1. Electromagnet:
- The key component of an electric bell is the electromagnet. It is made up of a coil of wire wound around a soft iron core.
- When an electric current flows through the coil, it creates a magnetic field around the core.
- The magnetic field produced by the electromagnet is temporary and can be turned on and off by controlling the flow of electric current.

2. Working Principle:
- When the electric current flows through the coil, it magnetizes the core, attracting the hammer towards it.
- The hammer hits the metal bell, producing a sound.
- The circuit is then broken, stopping the flow of electric current.
- As a result, the magnetic field disappears, and the hammer returns to its original position due to a spring mechanism.
- The circuit is completed again, and the process repeats, creating a continuous ringing sound.

3. Characteristics of an Electromagnet:
- An electromagnet can be turned on and off by controlling the electric current.
- It can produce a stronger magnetic field than a permanent magnet of the same size.
- The strength of the magnetic field can be increased by increasing the number of turns in the coil or by increasing the electric current flowing through it.
- The direction of the magnetic field can be reversed by reversing the direction of the electric current.

Conclusion:
The electric bell is an example of an electromagnet because it uses an electric current to create a temporary magnetic field, which is essential for its functioning.