Archived Some question about the Maxwell needle method experiment.

AI Thread Summary
The discussion focuses on the derivation of the formula for torsional rigidity, c=∏nr^4/(2L), and the origin of the constant ∏, as well as the identification of n as the rigidity modulus rather than Young's modulus. It questions whether the Maxwell needle method is equivalent to the torsional pendulum for calculating rigidity modulus and seeks to determine which method is superior. Participants express a need for guidance on obtaining torsional rigidity and inquire about standard values for the modulus of rigidity in a Maxwell's needle experiment. Overall, the thread highlights confusion regarding the theoretical and practical aspects of these physics concepts.
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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?

Homework Equations


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
 
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What is the standerd value of modulus of regidity of a maxwell's needle
 

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