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Archived Some question about the Maxwell needle method experiment.

  • Thread starter Outrageous
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1. Homework Statement
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. Homework 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:
What is the standerd value of modulus of regidity of a maxwell's needle
 

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