13. Charge q is given to two identical spheres P and Q. A third
uncharged sphere of equal size is touched with two spheres
one after another and then removed. The new force of
repulsion between spheres will be initially the force
between spheres is F) -
(1) 3/4 F
(2) 4/9F
(3) 2/3 F
(4) 3/8 F
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