Unit 8.3 Quiz 5

Which choice of core material for a solenoid (coiled wire) will result in the strongest electromagnetic field if all other factors remain equal?

• titanium

• plastic

• aluminum

• iron

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Which of the following would be the best electromagnet if the same amount of current was sent through each?

• Coil of wire with 20 turns wrapped around a cardboard core.

• Coil of wire with 50 turns wrapped around a cardboard core.

• Coil of wire with 20 turns wrapped around an iron core.

• Coil of wire with 50 turns wrapped around an iron core.

Which of the following compasses represents the magnetic field at point X?

• A

• B

• D

• E

• F

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Earth’s magnetic field is most likely due to:

• the rotation of Earth acting on all of Earth's magnetite.

• convection currents in the molten parts of Earth’s interior.

• a magnetized solid inner core of the Earth.

• the high concentration below the Earth’s surface of lodestone, a natural magnet.

• millions of small magnets buried in the Earth.

Suppose you move the left magnet closer to the right magnet as shown. What will happen as the magnets are moved closer together?

• The magnets will not interact until they touch each other.

• At some point, the two magnets will begin to attract each other.

• Since a person is pushing the magnet forward, it is the person applying the force, not the magnet.

• The force between the magnets will not change.

• The force between the magnets will increase as they get closer together.

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The magnetic field strength of a magnet is strongest:

• at both poles.

• at the north pole.

• at the south pole.

• all around the surface.

• in the middle.

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If you put a small compass in a magnetic field, the compass will:

• seek electrical charge concentrations.

• repel the field lines with the same charge.

• swing or rotate randomly.

• line up in a direction parallel to the magnetic field lines.

• line up in a direction perpendicular to the magnetic field lines.

A magnet can attract an unmagnetized paperclip because:

• paperclips become permanently magnetized in a magnetic field.

• a magnet can attract any metal.

• paperclips become temporarily magnetized in a magnetic field.

• a magnet exerts a force on any object.

• paperclips are really magnetized.

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