The figure below $($already seen in lecture$)$ shows three arrangements of an electron e and two protons $p.$ Find the magnitude of the net electrostatic force on the electron for each arrangement if $d=0\mathrm{.}5{10}^{-10}m$ and $D=1\mathrm{.}0{10}^{-10}m.$

$($b$)$

$($c$)$

$($a$)$

Answer: a$)1\mathrm{.}2{10}^{-7}N$

b$)6\mathrm{.}9{10}^{-8}N$

c$)9\mathrm{.}5{10}^{-8}N$