In the diagram below, each division on the horizontal axis is $0\mathrm{.}20m$ while each division on the vertical axis is $1\mathrm{.}5V.$ What is the electric field in each of the regions specified below?

E$]$

$($a$)$ from $0\mathrm{.}0m$ to $0\mathrm{.}30m$

$\frac{V}{m}$

$($b$)$ from $0\mathrm{.}30m$ to $0\mathrm{.}70m$

Does the graph in this region have a positive or negative slope?V $\frac{?}{m}$

$($c$)$ from $0\mathrm{.}70m$ to $0\mathrm{.}80m$

$\frac{V}{m}$