Two identical small conducting spheres, X X\,X and YYY, carry charges of +Q+Q+Q and −5Q-5Q−5Q respectively, and are separated by a distance ddd. The magnitude of the electrostatic force between them is FFF.
The spheres are brought into contact and then separated to a distance of 2d2d2d.
What is the magnitude of the new electrostatic force between the spheres in terms of FFF?
0.20F0.20F0.20F
0.25F0.25F0.25F
0.40F0.40F0.40F
0.80F0.80F0.80F