Magnetic Field due to a current loop

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Homework Help Overview

The discussion revolves around calculating the magnetic field due to a current loop, specifically focusing on a single loop of wire with a given radius and current, and determining the magnetic field at a specified distance along the axis of the loop.

Discussion Character

  • Exploratory, Assumption checking

Approaches and Questions Raised

  • Participants discuss the application of the magnetic field equation and express uncertainty regarding the correctness of their calculations. Questions arise about the requirements of the online homework system, including units and significant figures.

Discussion Status

The discussion has evolved with participants providing feedback on the original poster's calculations and assumptions. Some guidance has been offered regarding potential issues with the online system, but no explicit consensus has been reached regarding the calculations themselves.

Contextual Notes

Participants note that the online homework system may have specific formatting requirements, such as the need for answers in scientific notation, which could affect the perceived correctness of the submitted answers.

snoweangel27
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[SOLVED] Magnetic Field due to a current loop

Homework Statement



A single loop of wire of radius 3 cm carries a current of 2.6 A. What is the magnitude of B on the axis of the loop at 2 cm?


Homework Equations



B=\mu/(4\pi) * 2\pi(R^2)*I/(z^2+R^2)^(3/2)



The Attempt at a Solution


I = 2.6 A
R = .03 m
z = .02m

I calculate .000031 T
It should just be a simple matter of plugging in numbers, but every time I use this equation it ends up being wrong. If anyone could tell me what I might be doing wrong it would be greatly appreciated.
 
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Looks OK to me. Why do you think it's wrong?
 
It is computerized homework, so when I put in the answer that I calculated it keeps telling me that it is wrong. I have done the same thing with multiple different distances, and they all come up wrong, so I believe that it is something that I am doing, I am just not sure what
 
Those online systems can be flaky. I don't think you're doing anything wrong. Your equation is correct and your answer is correct.

Things to check: Are you sure they want the answer in Teslas? How many sig figs does the system like?
 
I finally figured it out. It turns out that the system decided it wanted it in scientific notation. Thanks for your help!
 

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