The energy of the magnetic field created by the current passing through a section of the circuit is determined by half the product of the inductance of this section and the square of the current strength. In any volume where a magnetic field is created, the field energy differs from zero and is proportional to the square of the magnetic induction.
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.