It is useful for experiments in electromagnetic induction,conservation of energy.It is basically a electromagnet which used for creating the magnetic field and to teach the concept of electromagnetism.It is a 16 cm long with approximately 700 turns of copper wire with maximum of 5 amperes current carrying capacity.Use this Air Core Solenoid to provide an external magnetic field where required and to change the rate of magnetic flux passing through a coil. It consists of a plastic spool with windings of insulated copper. It is useful for classroom experiments and demonstrations on magnetic fields.It is used as instrument apparatus for students,schools and laboratory.connect a power supply that does not put out more than 5 amps to the solenoid, with the positive lead at one terminal and the negative lead at the other terminal. The coil will generate a magnetic field when current passes through it. By using a compass, iron rod, or iron filings, students can study the nature of the electric field generated by this simple electromagnet.