Electromagnets Quiz

What creates the magnetic field in an electromagnet?

• Electric current

• Permanent magnet

• Solar energy

• Wind power

How can the magnetic strength of an electromagnet be altered?

• By increasing the humidity

• By varying the amount of electric current

• By changing the temperature

• By changing the color

What is the polarity of an electromagnet determined by?

• Amount of sunlight

• Direction of the electric current

• Type of metal used

• Number of coils

Where are electromagnets commonly used in waste yards?

• In small vehicles

• In large cranes

• In bicycles

• In airplanes

What material is commonly used to make the core of an electromagnet?

• Plastic

• Wood

• Iron

• Glass

How does the strength of an electromagnet compare to a permanent magnet?

• It is always weaker

• It is always stronger

• It depends on the material used

• It remains constant

What effect does increasing the number of coils have on an electromagnet?

• Decreases magnetic strength

• Increases magnetic strength

• Changes the color of the magnet

• Reduces the size of the magnet

How does the magnetic field of an electromagnet differ from a permanent magnet?

• It is weaker

• It is stronger

• It changes color

• It produces sound

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

• It decreases

• It remains the same

• It increases

• It changes direction