PhysicsWhat is the reason to pivot the compass needle on a sharp pin?

What is the reason to pivot the compass needle on a sharp pin?


  1. A
    To minimize the magnetic effect on the pin
  2. B
    To maximize the magnetic effect on the pin
  3. C
    To minimize the friction between the pin and the compass needle
  4. D
    To ensure that the compass needle will not drop from the pivoted point. 

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    Solution:

    Concept: Pivot the compass needle on a sharp pin.
    The compass needle on the sharp pin is not pivotted then the compass needle gets independent and rotates without any magnetic field in that region .
    So to minimize the friction between compass needle and the pin , the compass needle and the pin is pivoted
    Hence, the correct option is 3.
     
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