A sensitive magnetic instrument can be shielded very effectively from an outside field by placing it inside a box of -------

Options :
  1. teak wood
  2. plastic material
  3. soft iron of high permeability
  4. metal of high conductivity
Answer and Explanation :-

Answer: Option 3

Explanation:

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Hope is the greatest madness. What can we expect of a world that we enter with the assurance of seeing our fathers and mothers die? A world where, if two beings love each other and give their lives to each other, both can be sure that one will watch the other perish?
-Alfred de Vigny Stello