Magnetic Field at center of a Square loop

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Homework Help Overview

The discussion revolves around calculating the magnetic field at the center of a square wire loop with a specified current. The loop has a side length of 12.0 cm and carries a clockwise current of 15.0 A. Participants are examining the contributions of the wire segments to the magnetic field at the center.

Discussion Character

  • Exploratory, Assumption checking

Approaches and Questions Raised

  • Participants discuss the application of the Biot-Savart Law and question the validity of adding magnetic field contributions as scalars. There is a focus on the symmetry of the problem and the direction of the magnetic field vectors.

Discussion Status

Some participants express uncertainty about the correctness of their calculations and the method of combining magnetic field contributions. There is a recognition of differing opinions on how to approach the problem, with some feeling that previous replies did not address their concerns effectively.

Contextual Notes

Participants are navigating the complexities of vector addition in magnetic fields and the implications of symmetry in their calculations. There is mention of the specific dimensions of the wire segments and the current direction, which may influence the discussion.

Elvis 123456789
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Homework Statement


A square wire loop 12.0 cm on each side carries a clockwise current of 15.0 A

Find the magnitude of the magnetic field at its center due to the four 1.30 −mm wire segments at the midpoint of each side.

Homework Equations


B = (μ0*I)/(4π)*(2a)/(x√(x^2+a^2))

The Attempt at a Solution


I used the above equation for magnetic field at the center of the square loop due to one wire and then multiplied it by 4 since the contribution due to each wire segment is the same by symmetry.

B = 4*(4π*10^-7*15)/(4π)*(2*0.06)/(0.06*√(0.06^2+0.06^2))

B = 1.41*10^-4 T

This answer is wrong and I don't know why
 
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Elvis 123456789 said:
I used the above equation for magnetic field at the center of the square loop due to one wire and then multiplied it by 4 since the contribution due to each wire segment is the same by symmetry.

are you permitted to add them like scalars -as they are magnetic field vectors and their addition-rules are different.
 
drvrm said:
are you permitted to add them like scalars -as they are magnetic field vectors and their addition-rules are different.
As far as i know, the contributions from each wire are equal and in the same direction, so i can add them.
 
Elvis 123456789 said:
As far as i know, the contributions from each wire are equal and in the same direction, so i can add them.

You might have heared about Biot-Savart Law for calculating the B field due to current element -or see a reference to see the direction of the field.
Ref.http://hyperphysics.phy-astr.gsu.edu/hbase/magnetic/magcur.html
 
drvrm said:
You might have heared about Biot-Savart Law for calculating the B field due to current element -or see a reference to see the direction of the field.
Ref.http://hyperphysics.phy-astr.gsu.edu/hbase/magnetic/magcur.html
Yes, I used the law from scratch to end up with the result that I have. My problem is that I don't know where I am going wrong.
 
Elvis 123456789 said:
Yes, I used the law from scratch to end up with the result that I have. My problem is that I don't know where I am going wrong.

Elvis 123456789 said:
A square wire loop 12.0 cm on each side carries a clockwise current of 15.0 A

Find the magnitude of the magnetic field at its center due to the four 1.30 −mm wire segments at the midpoint of each side.

what is in your opinion the correct answer should be and how it differs from your calculation.?
 
drvrm said:
what is in your opinion the correct answer should be and how it differs from your calculation.?
I already figured out how to do the problem. No offense, but none of your replies helped in any way, at all. This isn't me trying to come at you in any way. I just found your replies to be either not relevant to the question, or just really vague like your last reply. Thanks for trying to help anyways though.
 

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