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 wasn't too bad. The trouble with Man was, even while he was having a good time, he didn't appreciate it. Why, thought Milligan, this very moment might be the happiest in me life. The very thought of it made him miserable.
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