Electricity, Magnetism and Electromagnetism

The earth is like a magnet because:

• It has a magnetic field due to its core

• it has a magnetic field do to its crust

• There is a magnetic pole in the earth's core

• Gravity generates a magnetic field

You can increase the strength of an electromagnet by:

• Decreasing the battery charge

• Decreasing the amount of loops in the solenoid

• Winding the coils more closely

• Winding the coils more loosely

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On an atomic level, what creates a magnetic force?

• gravity

• electrons

• protons

• neutrons

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What is the difference between a galvanometer and an electric motor?

• Electric motor does not require electric current

• Galvanometer uses electric energy

• In an electric motor, the wire spins

• an electric motor uses electric energy

you can inccrease the strength of an electromaget by

• Decreasing the current

• Decreasing the loops

• using a stronger iron (Ferro) material

• winding the coils more loosely

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In the diagram, an electric motor is pictured. This motor works by:

• The wire makes the magnets move

• The magnets spin and generate electricity

• The current causes the wire (Armature) to spin

• the magnets take energy directly from the battery

How do Maglev trains go up to 311 MPH?

• a train is pulled by a big magnet at the end of the tracks

• electric motors push the train and cause it to levitate

• Magnetized coils repel magnets on the train which moves it

• a generator creates electricity which fuels the train

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Electromagnetic Induction is a technical way to say that we can create a magnetic field using electricity.

• True

• False

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Magnetic Field lines around a bar magnet:

• are perpandicular the the magnet

• spread out from north pole and curve to south

• Cross back and forth over eachother

• are perfectly straight

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As the earth rotates, the magnetic poles:

• stay the same

• change a little

• Switch completely

• disappear