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Sketch the field lines for the magnetic fields associated with the currents shown in the diagram below. (The dots and crosses show the direction of the currents.) WARNING: The drawing is a a bit crappy. sorry. :/ |dw:1397260188233:dw|
Hi! Do you know that the magnetic field "spins around" a wire? Well, the direction of the field at a point ((due to one wire)) is always perpendicular to the imaginary line that connects it to the wire. But perpendicular could be two ways. |dw:1397261007941:dw|
Quick question, is this related to the right hand grip rule?

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Right!! Right hand rule. What you do is you take you're thumb. You point it in the direction of the current. Then you look how your fingers are curled. The magnetic field has that same curl!|dw:1397261214896:dw|
I assume that "x" is "into the screen."
and the dot out of the screen?
You try! :)
http://hyperphysics.phy-astr.gsu.edu/hbase/magnetic/magcur.html#c1
Now, magnetic field vectors add. So you'll see that |dw:1397261439666:dw||dw:1397261494265:dw|
And|dw:1397261563303:dw|will turn into
|dw:1397261630895:dw|
ahh now i understand! :) what does that arrow in between the dot and the cross represent?
You'll need to put these together or re-apply these concepts for you're bigger picture! :) The big arrow, here?|dw:1397261722560:dw|That's because the electric fields add, there, to be EXTRA strong! Between two of the same kind, however, the field CANCELS because they're in opposite directions. It's like \((1)+(-1)=0\)
ohhh woah you made it so easy.
I have to go. Good luck! I'm glad! :)
Thanks a lot!

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