Understanding Magnetic Field Direction from Two Wires at a Distance

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Homework Help Overview

The discussion revolves around understanding the direction of the magnetic field created by two wires positioned above and below the x-axis, particularly at a point far along the positive x-axis. Participants are exploring the implications of distance on magnetic field direction and the application of the right-hand rule.

Discussion Character

  • Conceptual clarification, Assumption checking, Exploratory

Approaches and Questions Raised

  • Participants are attempting to apply the right-hand rule to determine the magnetic field direction, questioning how distance affects this direction. There is confusion regarding the expected direction of the magnetic field at point X and how the position of the wires influences this.

Discussion Status

Several participants are actively engaging with the problem, sharing their interpretations and sketches. There is a mix of understanding and confusion, particularly regarding the effects of distance on the magnetic field's direction. Some guidance has been offered regarding the behavior of the field at large distances, but no consensus has been reached.

Contextual Notes

Participants are considering the scenario of being infinitely far from the wires, which raises questions about the assumptions made regarding the wires' positions and the resultant magnetic field direction.

Jstuff
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You have two wires an equal distance above and below the x-axis the top wire comes out of the page and the bottom wire goes into the page.
Finally, consider point X (not shown in the diagram) located on the x axis very far away in the positive x direction. Which of the vectors best represents the direction of the magnetic field created at point X by wire 1 alone?
Hey guys I am confused on this problem I know the answer is the field will point in the positive Y direction, but I do not understand why.
I thought it would point in the positive x direction because of the right hand rule.
How does the fact that the particles are at a very far distance effect the direction of the magnetic field since the direction of the field would not change it would just become weaker. Right?
 
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Sketch a set of axes, and mark on it the top wire, and point X far to the right.
 
I've done this. From this and using the right hand rule the magnetic field would point along the x axis. How does the fact that it is very far away on the axis change the direction of the magnetic field?
 
What is the direction of propagation? What direction is the electric field?
The way I understand this, your E field will be oriented with the wire (+Z), and propagation is in the (+X) direction.
 
Well the direction of propagation to my understanding is to the right in the +X direction. However, the answer is that it propagates in the +Y direction from the top wire which I do not understand.
 
This question was posted 6 years ago, but for anyone else confused here's why the the top wire makes a B field that points straight up at a point really far away:

Lets assume you're infinitely far away from the wire. When your that far away, the distance that wire 1 is above the x-axis becomes so small that you can't even see it. Essentially, the wire acts as if its directly on-top of the x-axis. This means that the tangent line on the x-axis infinitely far away is straight up. I hope that makes sense!
 
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