Magnetic field at a point above a metal strip.

1. The problem statement, all variables and given/known data
An infinitely long thin metal strip of width w=12cm carries a current of I=10A that is uniformly distributed across its cross section. What is the magnetic field at point P a distance a=3cm above the center of the strip?

2. Relevant equations

dB = (μ0*dI)/(2*∏*r)

3. The attempt at a solution

I evaluate the integral: ∫(μ0*I)/(2*∏*w)*(dr/r)

I am unsure of the limits and cannot get the correct answer.

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