A student observes interactions between two sets of electrically charged objects. In each set, the objects carry either a charge of -1 or +1 Coulomb. Which question can the student ask to identify the set with the stronger interaction?
a. How far apart are the objects in each interaction?
b. How large are the objects in each set?
c. What is the mass of each object in the interactions?
d. Are the objects both positively charged or both negatively?