To find the magnetic field, we'll use the equation for the magnetic field at a point due to a long straight wire given as:

$\overline{){\mathbf{B}}{\mathbf{=}}\frac{{\mathbf{\mu}}_{\mathbf{0}}\mathbf{i}}{\mathbf{2}\mathbf{\pi}\mathbf{r}}}$

I = 8.0 A

A. What is the magnetic field B at point a in the figure? Give your answer as vector.

B. What is the magnetic field B at point b in the figure? Give your answer as vector.

C. What is the magnetic field B at point c in the figure? Give your answer as vector.

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