Electromagnet Review

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 is the area around an object that can attract or repel other objects in that area?

• Magnetic Field

• Magnetic Fission

• Force

• Friction

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What is an electromagnet

• a magnet with a magnetic field powered by current

• a magnet that has no poles

• a very large magnet that is buried

• a very weak magnet

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Which of these is NOT necessary for a strong electromagnet?

• Iron Core

• Current

• Copper Wire

• Coiled wire

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What is one difference between electromagnets and bar magnets?

• Only bar magnets can be turned on and off

• Only bar magnets have a magnetic field

• Only electromagnets need current

• Only bar magnets are bigger

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What do two unlike pole do when they are brought together?

• Nothing

• Attract

• Repel

• Balance

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The arrow on magnetic field lines show them flowing in which direction?

• Left to Right

• North to South

• South to North

• Outside

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How can you reverse a magnetic field in a circuit?

• Flip the battery the other way

• Increase the current

• Increase the coils

• Use a different battery

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Why are electromagnets better than a bar magnet

• Electromagnets cannot be turned off

• Electromagnets can be turned off

• Bar magnets cannot be turned off

• Bar magnets can be turned off

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There are 3 ways to make electromagnets stronger, the picture shows 2. What is missing?

• Gold wire

• Smaller battery

• Iron paper clips

• Iron Nail