In Fig. $29-39,$ two circular arcs have radii $a=13.5 \mathrm{cm}$ and $b=$
$10.7 \mathrm{cm},$ subtend angle $\theta=74.0^{\circ},$
carry current $i=0.411 \mathrm{A},$ and share
the same center of curvature $P .$ What
are the (a) magnitude and (b) direction (into or out of the page) of the
net magnetic field at $P ?$