$-10$ In Fig. $29-41,$ a wire forms a semi$-$

circle of radius R$=9\mathrm{.}26$cm and two

$($radial$)$ straight segments each of

length L$=13\mathrm{.}1$cm$.$ The wire carries

current i$=34\mathrm{.}8$mA$.$ What are the $($a$)$

Figure $29-41$ Problem $10.$

magnitude and $($b$)$ direction $($into or

out of the page$)$ of the net magnetic field at the semicircle's cen$-$

ter of curvature C $?$