A student moves a horseshoe magnet across a tabletop with different distances from an electromagnet, as shown in the diagram below.

Question

Use the student’s observations below to any the following question:

Observations

20 inches: no force required

10 inches: small force required; easy to hold in place

5 inches: large force required; very difficult to hold in place



What do the student's observations demonstrate?

(1 point)
Responses

The electromagnet's magnetic field becomes weaker as more magnetic material is added to it.
The electromagnet's magnetic field becomes weaker as more magnetic material is added to it.

The electromagnet's magnetic field becomes stronger as a small amount of strength is added to the system by the battery.
The electromagnet's magnetic field becomes stronger as a small amount of strength is added to the system by the battery.

The electromagnet's magnetic field is stronger as more turns are added to the wire on the nail.
The electromagnet's magnetic field is stronger as more turns are added to the wire on the nail.

The electromagnet's magnetic field is stronger when close to it than far from it

Answer 1

The student's observations demonstrate:

The electromagnet's magnetic field is stronger when close to it than far from it.

This is evident from the fact that at greater distances (20 inches), no force is required to hold the horseshoe magnet in place, while at closer distances (10 inches and 5 inches), increasing force is needed, indicating that the strength of the magnetic field decreases with distance.