Two current carrying wire of infinite length are placed perpendicular to $x$-$y$ plane at $x=0$ and $x=R\sqrt{3}$ as shown in figure. Current in both the wires is same and inwards to the $x$-$y$ plane. Find ratio of $\left|\int \overrightarrow{B}·\mathrm{d}\overrightarrow{l}\right|$ in segment $CDA$ to segment $ABC$ will be :

A constant current source as shown in figure is connected across a galvanometer. If galvanometer is shunted by $4 \mathrm{\Omega }$ resistance then current in it is reduced to ${\left(\frac{1}{4}\right)}^{th}$ of initial value. If it is further shunted by $2 \mathrm{\Omega }$ resistance, current is further reduced by $\frac{k}{100}i$ while original current being same. Find value of $k$.