Electricity and Magnetic Fields

Which of the following are two effects of Earth’s magnetic field?

• compass points to geographic north, auroras seen at the equator
• compass points to geographic south, auroras seen at the equator
• compass points to magnetic north, auroras seen at both poles
• compass points to geographic north, auroras seen at both poles

What does electric current produce?

• A solenoid
• A magnetic field
• An aurora
• A bar magnet

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What strengthens a magnetic field made by a current-carrying wire?

• Increase the current and more coils
• Increase the current and less coils
• decrease the current and more coils
• decrease the current and less coils

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Electric current is made when a magnetic field

• Changes
• Gets stronger
• Gets weaker
• Stays the same

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Electric current that changes direction is called

• Generated current
• Mechanical energy
• Alternating current
• Direct current

Whether a material is magnetic or not depends on which of the following?

• The material's weight
• The material's mass
• The type of material
• The material's density

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As electrons move, they make

• atoms
• electricity and magnetic fields
• ferromagnetism
• auroras

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A compass needle responds to a magnetic field, because the compass needle is a 

• Transfomer
• Generator
• Motor
• Magnet

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What is created when a magnet moves through a coil of wire?

• An electric current
• An electromagnet
• A solenoid
• A ferromagnet

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What is created when a wire moves between the poles of a magnet?

• An electric current
• An electromagnet
• A solenoid
• A ferromaggnet 

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