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Archived Some question about the Maxwell needle method experiment.

  1. Mar 13, 2013 #1
    1. The problem statement, all variables and given/known data
    1)How do we obtain the formula of torsional rigidity ,c=∏nr^4/(2L) ?From experiment? then how do the ∏ come from? How do they know the n here is the rigidity modulus? Why it is not the young's modulus?
    2)Is Maxwell needle method same as the torsional pendulum? Both can be used to calculate rigidity modulus of a wire. Which is better ? Why?


    2. Relevant equations



    3. The attempt at a solution
    http://scienceworld.wolfram.com/physics/TorsionalPendulum.html
    I have tried to google and get some reference book but nothing about these .
    Guide will do . At least please tell me ways to get torsional rigidity. Just the name of experiment will do. Thank you
     
    Last edited: Mar 13, 2013
  2. jcsd
  3. Aug 13, 2016 #2
    What is the standerd value of modulus of regidity of a maxwell's needle
     
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