Exam-style question
Try this first
Which of the following statements about the force between two charges is true?.
- A.The force is always attractive.
- B.The force is always repulsive.
- C.The force can be either attractive or repulsive.
- D.The force is independent of the charges.
Model answer
What a good answer should say
- The force can be either attractive or repulsive.
Explanation
Why this works
Coulomb's law indicates that unlike charges attract each other while like charges repel each other, thus the force can be either type depending on the nature of the charges.
Common mistake
No common mistake is linked to this question yet.