Electric Charge and Electric Field – Study Notes

The image shows two boxes, each containing two identical spheres. In the left box, the spheres are positioned diagonally from each other, while in the right box, one sphere is moved to the top right corner. If the spheres are conducting and initially neutral, what happens to the distribution of charge when a positively charged rod is brought near the left side of each box?

If the spheres in the boxes are insulators instead of conductors, and a negatively charged rod is brought near the left side of each box, what is the most likely outcome?