I don't understand this question.

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SUMMARY

The discussion centers on a physics problem involving inductance, specifically related to a long solenoid and a closely packed coil. The confusion arises from the notation used for the number of turns, where 'N' is identified as 130 and 'n' as 220. Participants emphasize the importance of clarity in notation, suggesting that using distinct labels like N1 and N2 would enhance understanding. The need for the complete question and context is highlighted to resolve ambiguities in the solution.

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  • Understanding of inductance and solenoid principles
  • Familiarity with electrical current concepts (e.g., 1.5 A)
  • Knowledge of coil configurations and their parameters
  • Basic grasp of mathematical notation in physics
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  • Review the principles of inductance in solenoids
  • Study the differences between uppercase and lowercase notation in physics
  • Learn about the calculations involved in coil inductance
  • Examine examples of solenoid and coil configurations in physics textbooks
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SomethingWrong
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So I'm reading the book on physics in the chapter: Inductance.

The questions is: The long Solenoid turns/cm and carries a i = 1.5 A, its diameter D is 3.2cm. At its centre we place a 130- turn closely packed coil C of diameter d = 2.1cm. etc etc

My question is, in the solution the N is 130, but its 220.

And I noticed 2 N's. N and n. N is number of turns which should be 220 but its actually 130, and n is 220.

Shouldn't it be N1 and N2? Easier to understand, I completely skimmed it through and didn't see the lower case n.
 
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Your question is incomplete, I'm afraid. What formula are you using and what is the value of the "The long Solenoid turns/cm" ? Show us the whole thing.
 
Its hard to say. We would need to see the full description of the question and/or the book from which it came.

Notationally, authors are free to use whatever follows the general convention which means sometimes capitals are used for one set of parameters and lowercase for another.
 

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