What’s the right one.

J would be your best answer.

Explanation:

The closer the objects are to the charge, the greater the force. Granted, it entirely depends, and would not always be a linear line. Chances are, it would look more like answer choice G. However, note that Answer G does not start the greatest magnetic force at 0, which is where the strongest magnet force will be. The farther the object is, the weaker the force, which explains the downward trend.

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close lines strong magnet less close weaker