Magnetism Test Review

A student is building an electromagnet for his class experiment. He decides to add several more loops to the coil of wire. Which statement best describes the results of this change?

• The electromagnet breaks

• The electromagnet picks up less

• The electromagnet picks up more

• No changes

Which of the following energy conversions occur in an electric generator?

• Mechanical (Movement) --> Electrical

• Mechanical (Movement) --> Heat

• Electrical --> Heat

• Electrical --> Mechanical (Movement)

What happens to the magnetic field if the current through the wire increases?

• Increase in strength

• Decrease in strength

• Stays the same

• Reverses direction

Students have been tasked with determining if the electric current flowing through a wire would have any effect on a magnetic compass. Which of the following is NOT a variable that could affect their experiment?

• How close or far the compass is from the wire

• How much current is flowing through the wire

• The size of the compass

Which of the following actions will result in magnetic induction producing a greater amount of current?

• Decreasing the number of loops in the coil

• Moving the magnet faster through the coil

• Moving the magnet slower through the coil

• Using a weaker magnet

How can you decrease the electromagnet's magnetic strength?

• Have an iron core

• Increase the current

• Increase the number of coils (loops)

• Decrease the current

In the virtual lab, how did you create electricity from the magnetic field?

• Placed the magnet in the wire to cause current

• Placed the magnet outside the wire to cause current

• Moved the wire coil around the magnet to cause current

How can you create the most current in the lightbulb?

• Move the magnet slowly through the coil

• Move the magnet fast through the coil

• Place the magnet outside the coil

• Put the magnet next to the light bulb

When you move a magnet back and forth through a wire, what is produced?

• resistance

• magnetism

• current

• force

Which of the following energy conversions occur in an electric motor?

• Electrical --> Heat

• Mechanical (Movement) --> Heat

• Electrical --> Mechanical (Movement)

• Mechanical --> Electrical