When a current flows in a wire, it creates a circular magnetic field around the wire. The magnetic field is strongest closer to the wire and can be made stronger if the current is increased. , A solenoid consists of a wire coiled up into a spiral shape. When an electric current flows, the shape of the magnetic field is very similar to the field of a bar magnet., The small magnetic fields caused by the current in each coil of a solenoid add together to make a stronger overall magnetic field., A solenoid with an iron core is called an electromagnet. The iron core increases the solenoid’s magnetic field strength. , Electromagnets are used in devices such as electric bells, and door locks that can be controlled remotely.,

Electromagnets

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