A particle has a charge ofq$=2$e$,$ whereeis the charge on an electron. $($a$)$ Determine the electric potential $($inV$)$ due to the charge at a distancer$=0\mathrm{.}380$cmfrom the charge.V$($b$)$ Determine the electric potential difference $($inV$)$ between a point that is$2$raway and this point, that isV$(2$r$)$V$($r$).$V$($c$)$ Determine the electric potential difference $($inV$)$ between a point that is$2$r$$away and this point, that isV$(2$r$)$V$($r$).$V$($d$)$ How would the answers change if the electrons are replaced by protons? The sign of answer $($a$)$ would change. The sign of answer $($b$)$ would change. The sign of answer $($c$)$ would change. The sign of all answers would change. All answers would remain the same.