Coils are being made use of in electromagnets as an exciting source for production of magnetic field.

Coils are fundamental components in creating electromagnets, serving as the exciting source for the production of a magnetic field. When an electric current passes through the coil, it generates a magnetic field. The strength and direction of this magnetic field depend on the magnitude of the current and the number of turns in the coil. By coiling the wire, the magnetic field lines produced by each turn of the wire add together, greatly enhancing the total magnetic field produced. This principle is leveraged in electromagnets to create powerful, controllable magnetic fields that can be used in various applications, from electric motors and generators to magnetic resonance imaging (MRI) machines and particle accelerators.