PS 13 Electromagnet Quiz Review

Which electromagnet is stronger?

• A

• B

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What THREE ways are electromagnets different from permanent magnets?

• they can be turned off and on

• they can increase in strength by increasing the current in the wire

• they are smaller in size

• they can change which is the north and south pole

What makes an electromagnet?

• A coil of copper wire wrapped around an iron core connected to the battery

• A battery

• A coil of copper wire

• A permanent magnet

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How could you make electromagnet stronger?

• adding more loops of wire

• increasing the current flowing through the wires

• increasing the size of the iron core

• None of the above

What type of energy does a battery store?

(a)  

What happens when he connects the wire to the battery’s terminals?

• Nothing

• Electricity flows through the wire from one terminal to the other

• Electricity leaks from the battery

How does he turn the electromagnet off?

• Touching the wire with his hands

• By disconnecting it from the battery

• By pulling the screw out of the coils of wire

• He used "the force"

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What is the purpose of wrapping the wire into a coil?

• To make it look better

• To make it cool down

• To make it heat up

• To make the magnet stronger

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What happens if you reverse the electrical current by switching the wire ends?

• It explodes

• It makes it stronger

• It reverses the direction of the magnetic field

• It makes it weaker

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What are the ways you can change the strength of the electromagnet to make it stronger?

• Add more turns in the coil

• Add fewer turns in the coil

• Add more current flowing through the coil (more electricity)

• Add less electricity flowing through the coil

• Swap out the core and add a ferromagnetic material

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