Proper name explanation

The magnetic field generated by the electric current, in the solenoid, or the magnetic field generated by the current in the magnetic circuit is  a national high-tech enterprise, after more than 10 years of hard work, Huayuan Magnetics has built its own magnetic material production base, has various advanced instruments and equipment, and independently developed Production and sales of more than 10 kinds of materials and more than 1000 specifications of soft ferrite cores.