L22A
        Lesson 6: Static magnetic fields 2
        Magnetic field intensity H
        Physical meaning of each term

L22B
        Lesson 6: Static magnetic fields 2
        Physical meaning of each term
        Brief comparison (E, B), (D, H)
        Magnetic susceptibility

L22C
        Lesson 6: Static magnetic fields 2
        Example 6-10: magnetic circuit

L22D 
        Lesson 6: Static magnetic fields 2
        Magnetic flux
        Classification of magnetic materials
        Diamagnetic material
        Paramagnetic material
        Ferromagnetic material