Question

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Correct option is

$Step 1: Formula of Potential energy$

Electrostatic potential energy is given by $U$ between two charges placed at a separtion $r$ is given by

$⇒U=rkq_{1}q_{2} $

$Step 2: Calculations$

Putting values, $k=9×10_{9}C_{2}N.m_{2} ,$

$q_{2}=q_{1}=1μC=1×10_{−6}C,$

$r=1m$

$⇒U$$=19×10_{9}×1×10_{−6}×1×10_{−6} =9×10_{−3}J$

Hence, correct option is $C$.

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