What is the Ratio of I1 to I2 for Zero Magnetic Field at Points A, B, and C?

AI Thread Summary
To determine the ratio I1/I2 for zero magnetic field at points A, B, and C, the contributions of each wire's magnetic field must be analyzed. The magnetic field is calculated using the formula B = μI/(2πr), where μ is the permeability, I is the current, and r is the distance from the wire. The total magnetic field at each point is the vector sum of the fields from both wires. The discussion emphasizes the need to consider scenarios where one wire is absent to simplify calculations. Ultimately, finding the correct ratio involves equating the total magnetic fields to zero at the specified points.
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Homework Statement


Because of the 2 wires in the figure,
For what value of the ratio I1/I2 is the magnetic field zero at the point A? point B? point C?

Homework Equations


http://tinypic.com/r/5otweg/7

The Attempt at a Solution


I honestly have no idea where to start with this problem, any help is appreciated!

I tried to upload the picture and it seems to not be working for me? My computer is really old so i don't know if its just not loading, if not here's the figure. http://tinypic.com/r/5otweg/7
 
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Assuming the bottom wire didn't exist, do you know how to calculate the magnetic field (both magnitude and direction) due to the first wire at A, B, and C? How about if the bottom wire was there, but the top one wasn't? The total magnetic field is just the vector sum of the contributions due to each wire.
 
ideasrule said:
Assuming the bottom wire didn't exist, do you know how to calculate the magnetic field (both magnitude and direction) due to the first wire at A, B, and C? How about if the bottom wire was there, but the top one wasn't? The total magnetic field is just the vector sum of the contributions due to each wire.

Well then i would have to use B = ul/2pir?
So do i just find that for each of the wires and then add them together?
 

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