$(8\%)$ Problem $10$: A rod of length $L=0\mathrm{.}55m$ is placed along the $x-$axis from $x=0$ to $x=L.$ The rod

carries a uniform linear charge density of $=1\mathrm{.}965E-11\frac{C}{m}.$

$50\%$ Part $($a$)$ Find an expression for the infinitesimal charge along the rod in terms of the variables, $L,,x,y,$ and$/$or the differential positions $dx$ and $dy.$

$dq=dx$

$50\%$ Part $($b$)$ What is the value of the potential at the point $(x_{ob},y_{ob})$ in volts for $x_{ob}=1\mathrm{.}6m$ and $y_{ob}=0\mathrm{.}75m?$