Answer: The force of attraction is strongest where the magnetic field lines are the most concentrated, which occurs at the ends of the magnets (poles) and where the opposite poles of two magnets (e.g., north and south) are close to each other.

Explanation: Magnetic field lines represent the direction and strength of the magnetic field. The closer the lines, the stronger the magnetic force. In the image:

• The strongest attraction occurs at the interface between the north (N) pole of one magnet and the south (S) pole of another, as opposite poles attract each other.
• The force is weakest where like poles (N-N or S-S) are close, as they repel each other.