Some question about the Maxwell needle method experiment.

In summary, the conversation discusses the formula for torsional rigidity and how it is obtained through experimentation. There is confusion about the use of the symbol ∏ and the choice of rigidity modulus over Young's modulus. The conversation also compares the Maxwell needle method and the torsional pendulum, both of which can be used to calculate the rigidity modulus of a wire. The question of which method is better is raised. The conversation ends with a request for guidance on obtaining torsional rigidity and the standard value for the modulus of rigidity for a Maxwell's needle.
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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
 

Related to Some question about the Maxwell needle method experiment.

1. What is the Maxwell needle method experiment?

The Maxwell needle method experiment is a scientific procedure used to measure the viscosity and surface tension of liquids. It involves dropping a needle into a liquid and recording the time it takes for the needle to reach the bottom. This method was developed by James Clerk Maxwell in the 19th century.

2. How does the Maxwell needle method work?

The Maxwell needle method works by measuring the resistance of a needle as it falls through a liquid. The needle is dropped from a known height into the liquid and the time it takes to reach the bottom is recorded. This time can then be used to calculate the viscosity and surface tension of the liquid using a mathematical formula.

3. What are the advantages of using the Maxwell needle method?

One of the main advantages of the Maxwell needle method is its simplicity and ease of use. It can be performed with basic equipment and does not require complex procedures or calculations. Additionally, this method can be used to measure the properties of a wide range of liquids, making it a versatile tool for scientists.

4. What are the limitations of the Maxwell needle method?

The Maxwell needle method has some limitations that should be considered when using it. One limitation is that it is not suitable for highly viscous liquids, as the needle may not fall at a constant velocity. Additionally, this method may not be accurate for liquids with a high surface tension or for liquids that contain particles or impurities.

5. How is the Maxwell needle method used in real-world applications?

The Maxwell needle method has been used in various industries and research fields. It has been used to measure the viscosity of oil and other fluids in the automotive and manufacturing industries. It has also been used in the pharmaceutical industry to study the properties of different medications. Additionally, this method has been used in academic research to study the behavior of various liquids and to develop new theories and models.

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