Magnets
Review
Electricity
Mix-It
100
The region around a magnet where the magnetic force is exerted is known as its
magnetic field
100
The needle of a compass aways points to
Earth's magnetic north
100
lightning strikes and static shocks when you rub a sweater are examples of
electrical discharges
100
Earth's magnetic field can make a magnet out of an iron bar by causing the domains to
line up in the same direction.
200
Most materials are not magnetic because their magnetic domains are arranged
randomly
200
What charge do protons, neutrons, and electrons have?
protons (+)
neutrons (0)
electrons (-)
200
After an electrical discharge is the object positive, negative, or neutral?
Neutral
200
Ohm's law describe the relationship between resistance, voltage, and
current
300
Magnetic poles that are alike
repel
300
This diagram shows circular magnets on a pencil. What pole is B?
South
300
Materials that allow the charges of an electric current to move freely through them are called
conductors
300
Which method of transferring electrons does not require objects to touch?
induction
400
What happens if you break a magnet in half?
new north and south poles will form
400
Which method of transferring electrons does not transfer electrons between objects? Instead, the electrons move within their own object
Induction
400
Materials that block the flow of electrical charges are _________.
Examples include rubber and wood
insulators
400
Clothes in a dryer acquire static cling by
a. induction
b. conduction
c. friction
c. friction
500
A cluster of billions of atoms that all have magnetic fields lined up in the same way is known as a
magnetic domain
500
electrical charges that are unalike will _______ each other.
attract
500
Rubbing a balloon on your hair is an example of ______ and this causes the balloon to become _______ charged.
friction, negatively