$($c$29$p$5)$ Consider the circuit in the figure $($b$).$ The curved segments are arcs of circles of angle $\backslash (20^\{\backslash$circ$\}\backslash )$ and radii a $\backslash (=18\backslash$mathrm$\{$~cm$\}\backslash )$ and $\backslash (\backslash$mathrm$\{$b$\}=9\backslash$mathrm$\{$~cm$\}\backslash ).$ The straight segments are along radii. Find the magnetic field B at point P $($the center of curvature$),$ assuming a current of $10$ A clockwise in the circuit. $($Positive out of page and negative into page$)$

$($a$)$

$($b$)$

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