Magnetic Forces digital article

What happens when you cut a bar magnet in half?

• It loses its magnetic properties

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

• It becomes a temporary magnet

• It becomes a permanent magnet.

What is a magnetic field?

• A) A visible area around a magnet

• B) An invisible area around a magnet where it exerts magnetic force

• C) A field where gravity is strongest

• D) A field where electricity flows.

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What are permanent magnets?

• Materials that are always magnetic

• Materials that become magnetic only when near another magnet

• Materials that lose magnetism over time

• Materials that are never magnetic.

What is a temporary magnet?

• A magnet that is always magnetic

• A magnet that becomes magnetic only when near another magnet

• A magnet that never loses its magnetism

• A magnet that is not affected by other magnets.

Which elements are ferromagnetic? A) Iron, nickel, cobalt B) Gold, silver, copper C) Hydrogen, helium, lithium D) Carbon, nitrogen, oxygen.

• Iron, nickel, cobalt

• Gold, silver, copper

• Hydrogen, helium, lithium

• Carbon, nitrogen, oxygen

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How does the Earth behave in terms of magnetism?

• It has no magnetic properties

• It behaves like a gigantic magnet

• It repels all magnets

• It attracts only temporary magnets.

What does a compass needle point towards?

• The Earth's South Pole

• The Earth's North Pole

• The equator

• The magnetic equator.

What is the effect of a permanent magnet on an iron nail?

• The nail becomes a permanent magnet

• The nail becomes a temporary magnet

• The nail loses its magnetic properties

• The nail is unaffected.

What is the rule about the attraction of magnetic poles?

• Like poles attract, unlike poles repel

• Like poles repel, unlike poles attract

• Both like and unlike poles attract

• Both like and unlike poles repel.

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What is a magnetic field?

• A region around a magnet where magnetic forces are exerted

• A field where magnets are stored

• A field that blocks magnetic forces

• A field that enhances gravitational forces.

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