Magnetic Field:
When an electric current flows through a wire, it creates a magnetic field around the wire. This magnetic field is responsible for the attraction of magnetic materials towards the wire.

Explanation:
When a current flows through a wire, it generates a magnetic field in the surrounding space. This magnetic field consists of invisible lines of force that form closed loops around the wire. The strength and direction of the magnetic field depend on the amount and direction of the current flowing through the wire.

Attraction of Magnetic Materials:
Magnetic materials, such as iron, nickel, and cobalt, are affected by magnetic fields. When these materials come close to a wire carrying current, they experience a force due to the magnetic field produced by the current. This force causes the magnetic materials to be attracted towards the wire.

Example:
For example, if a wire carrying current is placed near a magnet or a piece of iron, the magnetic field produced by the current will interact with the magnetic field of the magnet or iron. This interaction results in an attractive force between the wire and the magnetic material. The stronger the current flowing through the wire, the stronger the magnetic field, and consequently, the greater the attraction between the wire and the magnetic material.

Applications:
The attraction between a wire carrying current and magnetic materials has various applications. Some common examples include:

- Electromagnets: By wrapping a wire around a magnetic core and passing a current through it, a strong magnetic field is created, turning the core into an electromagnet. This principle is used in devices such as electric motors, loudspeakers, and transformers.
- Magnetic Compass: The Earth's magnetic field aligns a magnetic needle in a compass. When a wire carrying current is brought near a compass needle, the needle deflects due to the magnetic field produced by the current.
- Magnetic Levitation: By utilizing the attractive forces between a wire carrying current and a magnet, magnetic levitation systems can be created. These systems are used in applications such as high-speed trains and magnetic bearings.

In conclusion, a wire carrying current produces a magnetic field, which is responsible for attracting magnetic materials towards the wire. This phenomenon has various practical applications and is based on the interaction between the magnetic field produced by the current and the magnetic field of the materials.

A current-carrying wire feels a force in the presence of an external magnetic field. It is found to be F=Bilsinθ F = Bi l sin θ , where ℓ is the length of the wire, i is the current, and θ is the angle between the current direction and the magnetic field.