Calculating Magnetic Field of a Solenoid: Where Did I Go Wrong?

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Homework Help Overview

The discussion revolves around calculating the magnetic field of a solenoid, specifically focusing on the application of the relevant formula and the interpretation of results. The original poster presents a scenario involving a solenoid with specific dimensions and current, seeking to identify an error in their calculations.

Discussion Character

  • Exploratory, Assumption checking

Approaches and Questions Raised

  • Participants discuss the formula for the magnetic field, with some reiterating the original poster's approach while others question the clarity of the original poster's problem statement. There is an exploration of the formula's application and the interpretation of the results obtained.

Discussion Status

The discussion is ongoing, with participants providing feedback on the original poster's calculations and questioning the accuracy of the results. Some guidance has been offered regarding the formula, but there is no explicit consensus on the source of the error or the correctness of the answer.

Contextual Notes

There is mention of a computer program providing feedback on the answer, indicating a potential discrepancy between the calculated result and expected outcomes. The original poster has not provided a final answer, which adds to the ambiguity of the discussion.

lw11011
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A solenoid 77.1 cm long has 340 turns and a radius of 1.92 cm. If it carries a current of 1.85 A, find the magnetic field along the axis at its center. Answer in units of T.
I know the formula for the magnetic field is:
Magnetic field = permeability x turn density x current
I entered -
B=(1.25664x10^-6)(340/.771)(1.85)
Where did I go wrong?
 
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Magnetic field = permeability x turn density x current

I think you could use this

[tex]B = \frac{\mu_0.I.N}{l}[/tex]
 
Last edited:
ranger said:
I think you could use this

[tex]B = \frac{\mu_0.I.N}{l}[/tex]

:-p He DID use that formula. You just reproduced what he said in words using symbols.
 
lw11011 said:
Where did I go wrong?

Looks ok so far. What makes you think that you went wrong? You didn't even post an answer, so it is not at all clear from your post what the problem is.
 
cepheid said:
:-p He DID use that formula. You just reproduced what he said in words using symbols.

:biggrin: I stand corrected :approve:
 
By using that formula I got the answer, 0.001 T. The computer program for our homework said the answer was wrong.
 

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