Understanding Magnetism

Magnetic forces are a result of:

• Electric charges in motion

• Static electric charges

• Gravitational forces

• Nuclear forces

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Magnetic poles are:

• the ends of a magnet where the magnetic force is strongest

• the center of a magnet

• the weakest part of a magnet

• the part of a magnet that does not attract metal

Magnetic fields are described as:

• Regions around a magnetic material where the force of magnetism acts.

• Areas where electric charges are stationary.

• Places where gravitational forces are strongest.

• Zones where sound waves are amplified.

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Magnetic domains are:

• regions within a material where the magnetic moments are aligned in the same direction

• individual atoms with magnetic properties

• areas where magnetic fields cancel out

• isolated magnetic poles

Electric Currents and Magnetic Fields interact in which of the following ways?

• Electric currents create magnetic fields

• Magnetic fields create electric currents

• They do not interact

• They cancel each other out

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Electromagnets are:

• Permanent magnets

• Temporary magnets created by electricity

• Magnets made of plastic

• Magnets that do not require electricity

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The magnetic force on a moving charge is dependent on which of the following factors?

• The velocity of the charge

• The magnetic field strength

• The angle between the velocity and the magnetic field

• All of the above

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The Magnetic Force on Current-Carrying Wires is:

• a force that acts on a wire carrying current in a magnetic field

• a force that acts on a stationary wire in a magnetic field

• a force that acts on a wire carrying current in an electric field

• a force that acts on a stationary wire in an electric field

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Earth's magnetic field is similar to that of a:

• bar magnet

• electric dipole

• permanent magnet

• solenoid

Biomagnetism is the study of:

• the magnetic fields produced by living organisms

• the electrical impulses in the brain

• the gravitational forces in the human body

• the chemical reactions in cells

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