Magnets and Electromagnetism Review

What happens when you reverse the polarity of an electromagnet?

• It becomes weaker.

• It changes direction.

• It turns off.

• It becomes a permanent magnet.

What is an electromagnet?

• a magnet that becomes neutral due to electricity

• a magnet created by electric current flowing through wires

• a magnet that produces electricity

• a electrical current that has magnets

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What effect does coiling a wire have on its magnetic field?

• Weakens the magnetic field

• Strengthens the magnetic field

• Eliminates the magnetic field

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What happens to the magnetic field of an electromagnet when the current is increased?

• It decreases

• It remains the same

• It increases

• It disappears

Answer explanation

When the current in an electromagnet is increased, the magnetic field strength also increases. This is due to the direct relationship between current and magnetic field intensity, making 'It increases' the correct answer.

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In the image, where is the magnetic field strongest?

• A
• B
• C
• They are all equal

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A paper clip is an example of a:

• magnetic material
• permanent magnet
• bar magnet
• insulator

Which material would a magnet pick up?

• Steel

• Rubber

• Copper

• Plastic

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Magnetic Force is

• A force of attraction between any two objects in the universe

• A force that acts between objects that are electrically charged

• The force of attraction or repulsion between unlike or like poles

• A contact force that resist motion between two objects that are touching

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Which of the following is true about electromagnets?

• Their polarities are fixed.

• Their polarities can be reversed.

• They are always on.

• They cannot be controlled.

When is something considered to be a magnet?

• When it attracts iron, nickel or cobalt
• When it has been magnet certified
• When it attracts wood, plastic and copper
• Once it no longer attracts things to it