Direction of magnetic field problem (Right Hand Rule)

AI Thread Summary
The discussion revolves around determining the direction of the magnetic field using the right hand rule in the presence of two currents, I1 and I2. The user has calculated the magnetic field expression but is unsure which current to use for the right hand rule. It is clarified that the direction of the magnetic field depends on which current is greater, and without specific values, the direction cannot be definitively determined. The expression for the magnetic field at R > F is noted to be incorrect due to a missing denominator. Ultimately, the direction of the magnetic field is contingent on the relationship between I1 and I2.
Tomi Kolawole
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Homework Statement


media%2F1da%2F1da9e30f-97fb-4afe-95f0-187c5571206a%2FphpK1ophx.png


Homework Equations

The Attempt at a Solution


I have already solved for the magnetic fields everywhere AND THE magnetic field at R>F = (U/2*PI*R)*(I2-I1)

My only problem is i know i use the right hand rule to determine the direction of the magnetic field B as clockwise or counter clockwise, however there are 2 currents i2 and i1 so which current do i put my thumb to determine the direction of B at R>F?
 

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Tomi Kolawole said:
I have already solved for the magnetic fields everywhere AND THE magnetic field at R>F = (U/2*PI*R)*(I2-I1)
This is incorrect. Your expression in the region R > F is missing a denominator. Anyway, since your expression has (i2-i1), put your thumb in the direction of i1 and do the right hand rule thing. Ultimately, the direction the B-field will depend on which of the two currents is greater than the other. If your are given that i2 > i1, then the direction will be as you have chosen, else it will be the opposite direction.
 
They didnt say which is greater than the other in the question stated above, so how can i know?
 
You can't possibly know unless you have numbers or at least someone tells you which current is greater than the other.
 
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