Like charges repel in electrostatics

Steps:

• Like charges (both positive or both negative) repel each other, while opposite charges attract.
• The spheres repel, so they must carry the same type of charge.
• Neutral spheres or those with opposite charges would not repel.
• Option A specifies both positive, matching the repulsion observation.

Why A is correct:

• Coulomb's law states that the force between two charges is repulsive if they have the same sign, explaining the observed repulsion for both positive charges.

Why the others are wrong:

• B: Opposite charges attract, not repel.
• C: Equal electrons could mean both neutral (no repulsion) or same charge, but doesn't specify charging.
• D: Equal protons indicates same element, irrelevant to net charge or repulsion.

Final answer: A