Solving a problem in physics section 28 paragraph 32 el

32. A solenoid 20 cm long and 4 cm in diameter has a dense three-layer coil of wire 0.1 mm in diameter. By the solenoid winding current flows 0.1A dependence B = f (H) for the core material shown in Fig. Determine the tension and the induction field in the solenoid, the magnetic permeability of the core, the inductance of the coil, energy and bulk density ener¬gii solenoid field.