T3L3* Quiz

How does an electromagnet work?

• A current flows through a wire wrapped around a metal core, creating a magnetic field.

• A battery directly connects to a nail, making it magnetic.

• A wire creates a magnetic field without electricity.

What is the role of a battery in an electromagnet?

• It provides electricity to create the magnetic field.

• It makes the nail magnetic on its own.

• It keeps the wire from heating up.

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What happens if more loops of wire are added to an electromagnet?

• The magnetic field becomes stronger.

• The magnetic field disappears.

• The nail loses its magnetic properties.

What tool can show the direction of a magnetic field?

• A compass

• A ruler

• A flashlight

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What happens if the electric current in an electromagnet increases?

• The magnetic field gets stronger.

• The magnetic field gets weaker.

• The magnetic field disappears.

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What happens when you turn off the battery in an electromagnet?

• The magnetic field disappears.

• The nail stays magnetic forever.

• The wire creates its own magnetic field.

Which material is best for the core of an electromagnet?

• Iron

• Plastic

• Glass

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How can the strength of an electromagnet be increased?

• Add more loops of wire.

• Use fewer loops of wire.

• Space the loops farther apart.

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What is one common use of electromagnets?

• In speakers

• In rulers

• In flashlights

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What happens to a magnetic field when you add more wire loops?