Three point charges $Q_1=-1\mathrm{.}61nC,Q_2=2\mathrm{.}96nC$ and $Q_3=4\mathrm{.}29nC$ are shown in the figure. The distance in the figure are: $d_1=1\mathrm{.}28cm,d_2=1\mathrm{.}2cm,d_3=1\mathrm{.}13cm$ and $d_4=1cm.$

The figure is not to scale.

$($A$)$ Find the electric field from each charge at the field point A$.$

$E_{Q1}=$

$E_{Q2}=$

$E_{Q3}=$

Find the total electric field at A$.$

$E_A=$

Find the acceleration of a proton and an electron placed at A$.$

$a_{\text{p}\text{r}\text{o}\text{t}\text{o}\text{n}}=$

$a_{\text{e}\text{l}\text{e}\text{c}\text{t}\text{r}\text{o}\text{n}}=$

$($B$)$ Find the electric field from each charge at the field point $B.$

$E_{Q1}=$

$E_{Q2}=20\mathrm{.}86*{10}^4\frac{N}{C}$

$E_{Q3}=$

Find the total electric field at B$.$

$E_B=$ Find the acceleration $of$ a proton and $an$ electron placed $atB.$

$a_{\text{p}\text{r}\text{o}\text{t}\text{o}\text{n}}=$

$a_{\text{e}\text{l}\text{e}\text{c}\text{t}\text{r}\text{o}\text{n}}=$