18. when considering a magnet's force of attraction over a known distance, you would expect the strength of attraction 4 inches away from the magnet to be weaker than the strength of attraction at 1 inch from the magnet.
a. 8 times
b. 4 times
c. 16 times
d. 6 times

When considering a magnet's force of attraction over a known distance, you would expect the strength of attraction 4 inches away from the magnet to be 16 times weaker than the strength of attraction at 1 inch from the magnet.

option C

Explanation:

The magnetic force of attraction is inversely dependent on the distance between the object and the magnet. That is the magnetic force of attraction is inverse proportional relation with the square of the distance between the object and the magnet.

Therefore, when the distance is 4 inches away, the magnetic force of attraction would be square of the distance that is 16 times. And as it is away, the force will be weaker.

i think the answer would be b