Swapnil posted an Question
January 16, 2020 • 01:32 am 15 points
  • IIT JAM
  • Physics (PH)

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usp8 Q4 I didn't understand question . what is needle and from where it comes how to get magnetic moment of needle?

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    Somnath best-answer

    Don't get cofused with the word needle.You have to find the magnetic moment of the magnetized steel wire when it bent ti form a semicircle. When it bent to a semicircle the distance between the two end of the wire changes. The distance between the two end of the wire(two pole pieces) is now the diameter(2r) of the wire. For details calculation see the attached file.

    upload_1579106668852.jpg
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