Magnetic field from two wires

  • Thread starter Jstuff
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  • #1
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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?
 

Answers and Replies

  • #2
NascentOxygen
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Sketch a set of axes, and mark on it the top wire, and point X far to the right.
 
  • #3
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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?
 
  • #4
RUber
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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.
 
  • #5
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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.
 

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