A system of three charges are placed as shown in the figure.
If $D > > d,$ the potential energy of the system is best given $b$
JEE MAIN 2019, Diffcult
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$U_{total}$ $=$ $U_{self\,of\, dipole} + U_{interaction}$
$=-\frac{k q^{2}}{d}-\left(\frac{k Q}{D^{2}}\right) q d$
$=-k\left[\frac{q^{2}}{d}+\frac{q Q d}{D^{2}}\right]$
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