Long straight wire/ magnetic field

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SUMMARY

The discussion centers on the concept of angles in relation to a long straight wire and its magnetic field. Participants clarify that the upper angle is considered π radians (180º) because it represents the total angle formed by the wire extending infinitely in both directions. The lower angle is defined as 0 radians due to its negligible size. The confusion arises from the interpretation of angles in the context of infinite lengths, which is a fundamental aspect of physics and mathematics.

PREREQUISITES
  • Understanding of basic trigonometry, specifically angle measurement in radians.
  • Familiarity with the concept of magnetic fields generated by current-carrying conductors.
  • Knowledge of the properties of straight lines in geometry.
  • Basic grasp of physics principles related to electromagnetism.
NEXT STEPS
  • Research the Biot-Savart Law and its application to long straight wires.
  • Study the relationship between current, magnetic field strength, and angle in electromagnetic theory.
  • Explore the concept of radians and their applications in physics and engineering.
  • Learn about graphical representations of magnetic fields around conductors.
USEFUL FOR

Students of physics, educators teaching electromagnetism, and anyone interested in the mathematical principles behind magnetic fields and angles.

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this seems a very basic question when i write it, but i don't understand this: when you are dealing with a "long straight" wire, a wire that you cannot see the top or bottom of, then why do you consider the upper angle to be pi?
i know why the lower angle is considered 0; it is so small... this might be more of a math question.

if i need to post a picture so you can understand what I am talking about, please let me know.
 
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is pi 180º?? And isn't a long straight line 180º? Not sure if that's what you wanted the diagram would be nice to see.

Also isn't there a homework thread lol ;)
 
aw, i feel dumb. that makes sense... let us never speak of this again.
 

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