A uniformly charged disk with radius

R $=25\mathrm{.}0$ cm

and uniform charge density

$=7\mathrm{.}70103$ C$/$m$2$

lies in the xy$-$plane, with its center at the origin. What is the electric field $($in MN$/$C$)$ due to the charged disk at the following locations?

$($a$)$

z $=5\mathrm{.}00$ cm

MN$/$C

$($b$)$

z $=10\mathrm{.}0$ cm

MN$/$C

$($c$)$

z $=50\mathrm{.}0$ cm

MN$/$C

$($d$)$

z $=200$ cm

MN$/$C