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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Life can be confusing. Good God, and how. Sometimes it seems like the older I get, the more confused I become. That seems ass-backwards. I thought I was supposed to be getting wiser. Instead, I just keep getting hit over the head with my relative insignificance in the greater scheme of the universe. Confusing, life. But it beats the hell out of the alternative.
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