The magnetic field created by the solenoid is used in electrical measuring instruments (ammeters, voltmeters), an electric bell, and an electric guitar. Two coils with a current have an electric meter and a wattmeter – a device that measures the power of an electric current. The current flowing through the windings of a complex configuration creates a magnetic field necessary for the operation of any electric motor.
Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.