an electric dipole on the x$-$axis consists of a charge $-$Q at x$=-$d and a charge $+$Q at x$=+$d$.($a$)$ find the general expression $($in terms of Q and d$)$ for the elctric field at points on the x$-$axis with x$>$dcdots An electric dipole on the $x-$axis consists of a charge $-Q$ at $x=-d$

and a charge $+Q$ at $x=+d.($a$)$ Find a general expression $($in terms of $Q$

and $d)$ for the electric field at points on the $x-$axis with $x>d.($b$)$ Show

that the magnitude of the field you computed in $($a$)$ is approximately

equal to $E=4kQ\frac{d}{x^3}$ and therefore approximates an inverse$-$cube dis$-$

tance law when $xd.$