Magnetic field between two parallel wires

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Homework Help Overview

The discussion revolves around calculating the equal currents in two parallel wires that create a magnetic field of 300 µT halfway between them, with considerations for both parallel and antiparallel configurations.

Discussion Character

  • Conceptual clarification, Assumption checking, Mathematical reasoning

Approaches and Questions Raised

  • Participants explore the relationship between the magnetic field and the currents in both wires, questioning the original poster's calculations and assumptions regarding the contributions of each wire to the total magnetic field.

Discussion Status

There is an ongoing exploration of the correct approach to account for the contributions of both wires to the magnetic field. Some participants suggest that the original poster may not have fully considered the effects of both currents, while others affirm the calculations for the antiparallel case.

Contextual Notes

Participants are discussing the implications of wire configuration (parallel vs. antiparallel) on the resulting magnetic field and the necessity to account for both wires in the calculations.

fishingspree2
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Homework Statement



Two parralel wires are 8 cm apart. The magnetic field halfway between them is 300 uT. What equal currents must be in the wires? Consider parralel and antiparralel currents

Homework Equations


I use Ia=Ib

B = (u*i) / (2*Pi*distance) where distance = 0.04 m (0.08m divided by two since it is halfway)

then I solve for I, I get 60 Amperes, the answers is 30 amperes

What to do?
 
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Maybe you are not taking into account that the magnetic field is due to the current of _two_ wires
 
Note that the forces on these two wires will attract each other, combining together and forming double the magnetic field because the fields are in the same direction :)
 
I think that it is correct for anti-parallel case. 30 A for each wire.
 
you have to consider currents for both wires. so in this case current will b 2i.
 

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