Magnetism & Electromagnetism

Candice learns that all magnets have two magnetic poles. Which of the following observations would best support this statement?

• When a bar magnet is cut in half, each half has a north and south pole.

• The north pole of a compass needle is attracted to the south pole of a bar magnet.

• When an electric current flows through a wire, a magnetic field forms around the wire.

• The strength of a horseshoe magnet's magnetic field decreases as the magnet is pulled away from another object.

During a lightning storm, the bottom of a cloud gains a strong negative electric charge. If you were to measure the charge at the top of a tall metal pole directly under the cloud, what would you expect to observe?

• The top of the pole would have a positive charge

• The top of the pole would have no charge

• The top of the pole would have a negative charge

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What is a permanent magnet?

• Has magnetic properties for a long time

• is magnetized by an electric current

• is not magnetized

• does not have a north or south pole

. Which of the following best describes a ferromagnetic material?

• A material that easily conducts electricity

• A material that produces its own magnetic field

• A material with naturally strong magnetic properties

• A material made of non-metals that produce magnetic fields

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Which of the following best describes a magnetic field?

• a measure of the length of a magnet

• the force that pushes two magnets away from each other

• an invisible region that surrounds the north pole of a magnet

• a region around a magnet in which you can measure magnetic forces

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Which of the following is the best definition of electromagnetism?

• The use of electrical energy to create magnets

• the use of magnets to generate electric currents

• the interaction between electrical energy and magnetism

• the appearance in nature of objects that have both electric and magnetic fields

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Joe has an idea to cut a bar magnet in half so that he can have one magnet with a north pole and one magnet with a south pole. What is wrong with this idea?

• It is impossible to cut a magnet in half.

• It is impossible to separate two opposite magnetic poles once they are in contact with each other.

• It is impossible to create a magnet with only one magnetic pole.

Which of the following determines whether or not a material is magnetic?

• the density of the material

• the weight of the material on Earth

• the alignment of atoms in the material

• the number of elements that make up the material

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Sometimes the north and south poles of atoms in a material will line up. What is the term for the region where this occurs?

• domain

• ferromagnetic

• magnetic field

• magnetic pole

A photographer travels to Earth's north pole to photograph the aurora, a beautiful light display in the sky. Which of the following are most responsible for the formation of the aurora?

• Earth's rotation and revolution around the Sun

• static electricity and electric current in the atmosphere

• charged particles from the Sun and Earth's magnetic field

• electromagnetic induction and particles in the atmosphere.

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