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Sorry. I know this question is on the forum somewhere, but I still don't get it... Thus.

For parallel wires, at the mid-point of the wires, what is the strength of the magnetic field? Do I use the formula [itex]B=\frac{μi_{1}i_{2}L}{2∏r}[/itex], or is it the sum of

[itex]B=\frac{μi}{2∏r}[/itex], for both wires? I'm really confused:(

For example,

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

I would use equation no. 1, but it is actually 2x equation (2). Thus I don't really get, how to calculate the magnetic field between 2 parallel current carrying wires? And when to use equation (1)?

Thank you.

2. Relevant equations

3. The attempt at a solution

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# Homework Help: Magnetic field between 2 parallel wires

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