How to solve

Ex :$-$ A uniform line charge, ${}_L=25\frac{nc}{m},$ lies on the line $x=-3,z=4,$ in frees space. Find $E$ in Cartesian components at

$($b$)P_1(2,15,3)$;

sol:$-$

$($c$)F$

$($a$)$ the origin

$($a$)$

:$\text{'}x=-3$

$z=4$

$($i$)4,=60,z=2)$