Hurry please
What could Eric have changed in his electromagnet that caused the decrease in magnetic force from point A to point B?
(You MUST give at least 3 possible reasons/changes in the electromagnet)

Decrease the number of loops of wire Decrease the current by lowering the potential difference of the battery.Move the electromagnet away

Explanation:

There is not context to know how the electromagnet is built and what the the points A, B, and C represent. Nevertheless, you can conclude from the graph that the force of the electromagnet decreased linearly from the situation A to the situation B.

The strength of the force from an electromagnet depends on:

Number of loops of wire around the ferromagnetic coreCurrent, which in turn depends on the potential difference (voltage)Ferromagnetic properties of the coreDistance between the electromagnet and the spot were you are calculating the force.

How those factors can be modified to decrease the magnetic force from point A to point B:

Decrease the number of loops of wire (the less the number of loops the less the weaker the electromagnet)Decrease the current by lowering the potential difference of the battery.Move the electromagnet away, because the farther the less the force.