4 centimeters 8 centimeters 12 centimeters 16 centimeters
I gave my students this multiple choice question: A magnet and a metal paper clip have the strongest magnetic attraction when the distance between them is

Only one answer is correct among these 4 choices:
- 4 centimeters
- 8 centimeters
- 12 centimeters
- 16 centimeters

Could you tell me which one is correct?

4 centimeters