Direction of the magnetic field

AI Thread Summary
The discussion centers on understanding the direction of the magnetic field created by current-carrying wires. Participants clarify that when currents flow in the same direction, the wires attract each other, while opposite currents repel. The focus is on calculating the magnetic field at a specific point, denoted as point P, rather than the forces between the wires. The correct approach involves using the right-hand rule to determine the magnetic field's direction. Overall, the conversation emphasizes the importance of distinguishing between magnetic fields and forces in this context.
Cici2017

Homework Statement


Screen Shot 2017-07-22 at 10.11.37 am.png


Homework Equations

The Attempt at a Solution


I know if the currents are going the same direction they attract. So the top 2 attract each other and the bottom two attraction each other? And then the top repel the bottom...
I'm stuck, please help~
 
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Cici2017 said:
I know if the currents are going the same direction they attract. So the top 2 attract each other and the bottom two attraction each other?
Don't worry about the forces the wires exert on each other. You are asked to find the field at point P. What's the field from a current-carrying wire?
 
Doc Al said:
Don't worry about the forces the wires exert on each other. You are asked to find the field at point P. What's the field from a current-carrying wire?
Magnetic field?
 
Cici2017 said:
Magnetic field?
Yes. So how do you find the magnetic field surrounding a current-carrying wire?
 
B=F/ILsinθ
The direction is determined by right hand rule?
mmm...I don't know, what do I do next?
 
Cici2017 said:
B=F/ILsinθ
Wrong formula. Again, you are not finding the force on a current-carrying wire, but the field surrounding it.

Read this: Magnetic Field of Current
Cici2017 said:
The direction is determined by right hand rule?
Yes! Read the above link.
 
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