Find the total charge: $($a$)$ on the line given by $0<$ x $<5$ m$,$ if $$L $=12$x$2$ mC$/$m; $($b$)$ on a cylinder given by $=3$ m and $0<$ z $<4$ m$,$ if $$s $=$z$2$ nC$/$m$2$; $($c$)$ inside a sphere with r $=4$ m s$10$ C$/$m rsen