Students attempted to use the setup shown above to demonstrate how an electromagnet works. They attempted to attract the paper clip up off of a table surface to the iron nail, but the paper clip did not move from its position on the table. Which statement correctly describes the forces acting on the paper clip when it failed to move? A. The only force acting on the paper clip was a magnetic force. B. The magnetic force applied to the paper clip was insufficient to overcome the frictional and gravitational forces acting on the paper clip. C. There were no forces acting on the paper clip. D. The frictional and gravitational forces acting on the paper clip were too weak compared with the stronger magnetic force applied to the paper clip.

1.) Attractive and repulsive properties of the magnetic poles

2.) The magnetic force of the object 1 cm away will be 36 times stronger than the magnetic force of the object that is 6 cm away.

Explanation:

1.) Magnetic Levitation vehicles don't require engine neither do they consume fuel. They are high speed vehicles that are lifted by magnetic repulsion, and propagate along an elevated guideway by strong powerful magnets attached to the vehicle without no physical contact with the guideway.

Maglev vehicles are raised off the track when it levitates by magnetic attraction, in which levitation  magnets on the underside of the guideway attract the opposite poles of magnets on the wrap around section of the  maglev.

2.) Magnetic force obeys an inverse square law with distance.

The magnetic force of the object 1 cm away will be 36 times stronger than the magnetic force of the object that is 6 cm away. Because the magnetic force is inversely proportional to the square of the distance.