The magnetic field for each semi-circle is given by:

$\overline{){\mathbf{B}}{\mathbf{=}}\frac{{\mathbf{\mu}}_{\mathbf{0}}\mathbf{I}}{\mathbf{4}\mathbf{r}}}$

Let's take the magnetic field on the inner semi-circle to be B_{1} and that on the outer semicircle to be B_{2}.

You may want to review (Page 796).

For help with math skills, you may want to review:

What is the strength of the magnetic field at point P in the figure? Assume that I = 5.2 A , r_{1} = 1.1 cm , and r_{2} = 2.2 cm .

What is the direction of the magnetic field at point P in the figure?

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