Magnetic Fields Test

Class Period

• 2
• 3
• 4
• 5

How does magnetic force affect the energy in a system of magnets when the magnets are released and begin to move?

• The magnetic force increases the potential energy in the system.
• The magnetic force decreases the kinetic energy in the system.
• The magnetic force changes kinetic energy into potential energy
• The magnetic force changes potential energy into kinetic energy.

What do electric charges have in common with magnetic fields?

• They can both attract and repel objects at a distance
• They can both repel objects once they touch each other
• They both contain magnetic domains made out of iron
• They both can attract objects when same poles get near each other

A student is conducting an investigation to show how magnetic forces can act at a distance from an object. What can the student conclude from the data that he gathered in his investigation?

• The force is not related to the distance from the object.
• The force of the magnet becomes stronger the farther it is from the object.
• The force is stronger with less distance between the magnet and the object.
• The force of the magnet becomes stronger and then weaker the farther it is from the object.

A teacher sprinkles some iron shavings on a clear tray. She places two magnets in the shavings with the north ends facing each other. Based on the cause-and-effect relationship between the magnets, which phenomenon is the teacher modeling for her students?

• electrical force
• attractive force
• field of repulsion
• gravitational attraction

Ramon puts two magnetic toy trains very close to each other on a track. What will happen next, and why?

• The trains will move closer to each other because the magnetic force will pull the trains together.
• The trains will not move because the magnets are not touching.
• The trains will move away from each other because the magnetic force will push the trains apart.
• The trains will move away from each other because the magnets are not touching.

How many poles does a bar magnet have?

• none
• one
• two

Which combination of magnetic poles will repel each other?

• North and north
• North and south
• South and north

What can be done to increase the potential energy for two magnets who repel each other?

• move them closer together
• move them farther apart
• keep them still
• only have one magnet present at a time

What can be done to increase the potential energy for two magnets who attract each other?

• move them closer together
• move them farther apart
• keep them still
• only have one magnet present at a time