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)
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 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