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. are the objects both positively charged or both negatively charged?
b. what is the mass of each objects in the interactions?
c. how large are the objects in each set?
d. how far apart are the objects in each interaction?