A certain region of space is to be shielded from magnetic fields. Suggest a method

Explanation

(e) Consider soft iron substance (which has very high value of permeability) with some cavity (empty space). When this substance is subjected to external magnetic field its majority field lines prefer to pass through soft iron (due to its very high permeability) and so very few field lines pass through the region of cavity. Hence, if same substance is kept in this cavity then A/most no magnetic field lines pass through it. In other words, region of cavity is not affected by external magnetic field and so it is said to be magnetostatically shielded. This phenomenon is also called "magnetic screening".