Quiz #6: Electric and Magnetic Fields

What are electric and magnetic fields?

• Areas where forces can push or pull objects without touching

• Areas where objects must touch to exert force

• Fields that only exist in outer space

• Fields that are visible to the human eye

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Which metals are commonly attracted by magnets?

• Gold, silver, copper, and aluminum

• Iron, nickel, cobalt, and steel

• Lead, zinc, tin, and brass

• Platinum, palladium, rhodium, and iridium

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How do magnetic fields appear when using iron filings?

• As straight lines between the poles

• As lines that extend from one pole and curve around to the other pole

• As circles around the magnets

• As random scattered lines

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What happens when like poles of two magnets are near each other?

• They attract each other

• They repel each other

• They have no effect on each other

• They create a spark

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What happens when objects with opposite electric charges come into contact?

• They repel each other.

• They attract each other.

• They become neutral.

• They lose their charge.

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How can you detect a magnetic field?

• By measuring the temperature.

• By observing its effect on a charged object.

• By using a thermometer.

• By listening to sound waves.

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What determines the strength of an electric field?

• The color of the object.

• The size of the object.

• The amount of charge and distance from the object.

• The temperature of the object.

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How does the size of a magnet affect its magnetic field strength?

• A smaller magnet has a stronger field.

• A bigger magnet has a stronger field.

• Size does not affect magnetic field strength.

• Only the material affects the field strength.

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What is an electromagnet?

• A magnet that is always on

• A magnet that can be turned on and off

• A permanent magnet

• A magnet that does not require electricity

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What role does a permanent magnet play in a speaker?

• It creates sound waves directly

• It vibrates to produce sound

• It interacts with an electromagnet to cause vibrations

• It powers the speaker