Differences Between Permanent Magnets and Electromagnets

What is a magnet capable of producing?

• Magnetic field

• Gravitational field

• Electromagnetic waves

• Electric field

What happens to the atoms of a non-magnetic substance when a magnet is brought near?

• They become magnetic

• They align and point towards the magnet

• They remain the same and point in different directions

• They repel the magnet

What is a key property of permanent magnets?

• They can be turned on and off

• They are composed of highly magnetized hard materials

• Their magnetic strength can be controlled

• They lose magnetism over time

Which of the following is a common use of permanent magnets?

• Loudspeakers

• MRI machines

• Magnetic locks

• Fridge magnets

How is an electromagnet created?

• By using a magnetic strip

• By using a permanent magnet

• By winding wire around a soft iron core and passing current through it

• By aligning atoms in a substance

What happens to an electromagnet when the electric current is turned off?

• It changes its poles

• It becomes a permanent magnet

• It loses its magnetic properties

• It becomes stronger

Which of the following is a use of electromagnets?

• Computers

• Generators

• Magnetic locks

• Fridge magnets

What is a key difference between permanent magnets and electromagnets?

• Electromagnets can have their magnetic strength controlled

• Permanent magnets can be turned on and off

• Permanent magnets are made of soft magnetic materials

• Electromagnets are always magnetized

Can the poles of a permanent magnet be changed?

• Yes, by using electricity

• No, they are fixed

• Yes, by heating the magnet

• No, but they can be reversed

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