Magnets and Magnetic Field of the Earth

Juanita sticks a nail to the end of a bar magnet. She then sticks a second nail to the first, then another to that one, and so on. When she gets to the seventh nail, it falls off the sixth nail.

Which statement best describes the forces acting on the seventh nail?

• The force of magnetism is equal to the force of gravity.

• The force of gravity is stronger than the force of magnetism.

• The force of magnetism is stronger than the force of gravity.

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The magnetic field lines of a bar magnet spread out from the

• north end to the south end.

• south end to the north end.

• edges to the center.

• center to the edges.

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A north pole will ______ a north pole.

• attract

• repel

A north pole will _________ a south pole.

• attract

• repel

Three magnets are placed on a plastic stick as shown in the image. The magnets are floating above each other because the _______________ ,which causes the magnets to push away from each other.

• same poles are closest together

• opposite poles are closest together

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Which statements accurately describe Earth’s magnetic field? Check all that apply.

• The magnetic field lines flow from Antarctica to northern Canada.

• The magnetic field is created by magnetic rocks on the surface.

• The magnetic poles line up exactly with Earth’s geographic poles.

• The magnetic field is generated in Earth’s core.

• The magnetic field is similar to the magnetic field of a bar magnet.

A compass always points to Earth’s true North Pole because the north pole of the magnet in the compass is attract to Earth’s ____________ magnetic pole.

Which statements describe the characteristics of a magnet? Select four options.

• A magnet attracts objects containing iron.

• A magnet attracts objects containing aluminum.

• A magnet repels other magnets.

• A magnet attracts other magnets.

• A magnet aligns with Earth’s north pole.

Which statements best describe magnetic fields? Select three options.

.

• A magnetic field is the area around a magnet where a force is exerted on certain objects.

• A magnetic field is an area of land where magnets are found.

• Magnetic field lines are strongest around the middle of the magnet.

• Magnetic field lines spread out of the north end of the magnet.

• Magnetic fields are three-dimensional and resemble a bubble.

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If a magnet is broken into two pieces, what happens to the magnetic poles?

• One piece will have a north pole, while the other piece will have a south pole.

• Each piece will still have a north pole and a south pole.

• Each piece will have only a north pole.

• Both pieces will no longer have any magnetic poles.