Exploring the Magnetic Field of Permanent Magnets

What is one key difference between magnetic force and gravitational force?

• Magnetic force is weaker than gravitational force.

• Magnetic force only affects iron objects.

• Magnetic force is much stronger than gravitational force.

• Gravitational force can repel objects.

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What happens when the north pole of one magnet is brought close to the north pole of another magnet?

• They create a new magnetic field.

• They repel each other.

• They have no effect on each other.

• They attract each other.

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What is the source of a magnetic field in an atom?

• Atoms vibrating in place.

• Neutrons moving in the nucleus.

• Electrons orbiting and spinning.

• Protons spinning in the nucleus.

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Why isn't a piece of paper magnetic?

• Its atoms' magnetic fields are randomly oriented.

• It doesn't contain any atoms.

• It has too many protons.

• It is too light to be magnetic.

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What can cause a magnetized piece of iron to lose its magnetism?

• Bending it into a new shape.

• Cooling it down.

• Submerging it in water.

• Heating it or banging it.

How do the magnetic field lines behave around a bar magnet?

• They come out of the south pole and go into the north pole.

• They form circles around the magnet.

• They come out of the north pole and go into the south pole.

• They cross each other at the poles.

What is a horseshoe magnet?

• A magnet with only one pole.

• A bar magnet bent into the shape of a horseshoe.

• A magnet shaped like a circle.

• A magnet shaped like a bar.

What happens to the magnetic field lines when two north poles of magnets are brought close together?

• The lines repel and curl away from each other.

• The lines attract each other.

• The lines cross each other.

• The lines disappear.

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Why does a compass needle point towards the geographic north pole?

• Because the compass needle is attracted to the sun.

• Because the geographic north pole is a magnetic south pole.

• Because the geographic north pole is a magnetic north pole.

• Because the compass needle is repelled by the south pole.

What is the magnetic south pole of the Earth?

• The center of the Earth.

• The geographic north pole.

• The geographic south pole.

• The equator.