Reading: Magnetism

What is the primary reason magnets can attract or repel each other?

• Due to magnetic fields

• Because of gravitational forces

• Through chemical reactions

• By thermal energy

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Which of the following materials is known to be strongly ferromagnetic?

• Copper

• Aluminum

• Iron

• Plastic

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What happens when you cut a bar magnet in half?

• It turns into a non-magnetic material

• It becomes a single pole magnet

• You get two smaller magnets, each with a north and south pole

• It loses its magnetism

Who proposed that Earth is a giant magnet?

• James Clerk Maxwell

• William Gilbert

• Michael Faraday

• Hans Christian Oersted

What is the unit of measurement for magnetic field strength in the SI system?

• Tesla

• Newton

• Joule

• Gauss

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Which scientist is known for formulating the theory of electromagnetism?

• Albert Einstein

• Isaac Newton

• James Clerk Maxwell

• Niels Bohr

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What is the Curie temperature?

• The temperature at which a material melts

• The temperature at which a material becomes radioactive

• The temperature at which a material loses its magnetism

• The temperature at which a material becomes superconductive

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What is an electromagnet?

• A magnet created by electric current

• A naturally occurring magnet

• A permanent magnet

• A magnet that works only in space

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Which of the following is NOT a use of magnets?

• Holding refrigerator doors closed

• Generating electricity in power plants

• Reading and writing data on hard drives

• Cooking food

What is the main component of lodestone?

• Gold

• Silver

• Iron

• Copper