A small uncharged conducting sphere is placed in contact with an identical sphere but having 4 × 10–8 C charge and then removed to a distance such that

A small uncharged conducting sphere is placed in contact with an identical sphere but having 4 × 10–8 C charge and then removed to a distance such that the force of repulsion between them is 9 × 10–3 N.The distance between them is (Take 

 as 9 × 109 in SI units)   

(1) 2 cm

(2) 3 cm

(3) 4 cm

(4) 1 cm                    (JEE-2025)