To identify the set with the stronger interaction between two sets of electrically charged objects, the student should ask:
Are the objects both positively charged or both negatively charged?
The interaction between charged objects is influenced by the nature of their charges. According to the principles of electrostatics, like charges repel each other, while opposite charges attract. The strength of the interaction is also dependent on the magnitude of the charges and the distance between them, but knowing if the charges are the same or opposite will give immediate insight into the nature of their interaction.
Other questions, such as the size and mass of the objects, are less relevant to the strength of the electric interactions compared to the nature of their charges. The distance between the objects does influence the interaction but does not help identify which set has a stronger fundamental interaction without knowing the charges involved.