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**1. Homework Statement**

A wire carries a current of 30A along the x-axis from x = 0 to x = 3.0 cm. Determine the magnitude in uT of the magnetic field at the point y = 4.0 cm on the y-axis.

**2. Homework Equations**

dB = (u/4pi) ((Ids x r)/r^2)

**3. The Attempt at a Solution**

We tried using this formula, but it didn't work. We are lost. Please help! Be descriptive if you can.