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1. The problem statement, all variables and given/known data

http://img80.imageshack.us/img80/5625/jonesj2qm4.gif [Broken]

If r = 30.0 mm, i = 2.00 A, and i' = 8.60 A, what is the magnitude of the magnetic field at the center point?

2. Relevant equations

B=([tex]\mu[/tex][tex]_{0}[/tex]I)/(2pi*r)

3. The attempt at a solution

I applied biot-savart's law to i and i', and added them together.

For B_i:

(4pi*10^-7*2)/(2pi*.03) = 1.34*10^-5

For B_i':

(4pi*10^-7*8.6)/(2pi*.03) = 5.74*10^-5

B_center = B_i + B_i' = 7.08*10^-5

Which is not correct. I'm pretty much sure my method at solving the problem is completely wrong. I just don't know what exactly is the right steps to take. Any help would be appreciated.

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# Homework Help: Magnetic Field of Two Wires

**Physics Forums | Science Articles, Homework Help, Discussion**