Magnets
What two poles must every magnet have?
What are the two types of electric charges?
Positive and negative
Why do electrical devices affect compasses?
Electric currents produce magnetic fields.
As you get farther away from a magnet, its force _________.
Decreases
How many dogs does Mr. Walker have?
Three
Opposite poles __________ and same poles ________.
attract, repel
What is an electric current?
Electrons flowing through a conductor.
How does flipping a light switch turn the lights off and on?
Moving a magnet back and forth within a coil of wire will induce a _________.
current
How old is Mr. Walker?
32 years young
Name two ways to increase the strength of an electromagnet.
More coils and more current
The two particles that are responsible for electric charges are _________ and _________.
Why are birds not shocked while they sit on a powerline?
They are not part of the circuit, unless they touch something.
What polarity does the North Pole of the earth have?
South
What type of business does Mr. Walker own?
Bait and tackle company
Which direction do the magnetic field lines travel around a north pole?
outwards
Which way do electric field lines go in a negative charge?
inward
How are electromagnets used in headphones and speakers?
Electromagnets sit in the middle of a permanent magnet. The electromagnet changes polarity, causing it to vibrate against the diaphragm.
Why does rubbing a magnet against iron cause it to become a temporary magnet?
It aligns the domains within the iron.
Name one of Mr. Walker's top 3 favorite tv shows. (2 guesses)
The Office, House, My Hero Academia
Why does magnetic force increase as you get closer to the poles of a magnet?
Increased magnetic field line density.
If a small positive charge was placed between a larger positive and negative charge, how would it travel?
It would travel towards the negative charge, following the electric field lines.
How are DC motors made using electromagnets?
An electromagnet changes polarity within a permanent magnet, causing it to spin.
Why are charges able to travel through our bodies, like when we rub our feet on the floor, then touch the doorknob with our hand?
Water is a conductor. Our bodies are mostly water.
Name one job Mr. Walker has had, other than teaching.