Magnets
Circuits
Review
Electricity
Mix-It
100
The region around a magnet where the magnetic force is exerted is known as its
magnetic field
100
Ohm's law describe the relationship between resistance, voltage, and
current
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
A positive balloon approaches 2 neutral metal spheres that are touching as seen in Figure 1. If the two spheres are separated, and then the balloon is removed as shown in Figure 2, what charge will the sphere have?
A-negative
B-positive
200
Most materials are not magnetic because their magnetic domains are arranged
randomly
200
A complete, unbroken path through which electric charges can flow is an
electric circuit
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
What type of charge transfer is shown?
induction
300
Magnetic poles that are alike
repel
300
True or False: An open circuit allows the flow of electrons
False
300
True or False: Electroscopes can detect the presence of an electric charge.
True
300
Materials that allow the charges of an electric current to move freely through them are called
conductors
300
Earth's magnetic field can make a magnet out of an iron bar by causing the domains to
line up in the same direction.
400
What happens if you break a magnet in half?
new north and south poles will form
400
What causes charge to move in a circuit?
voltage
400
What is a characteristic of a series circuit?
bulbs are dim
if one bulb goes out, they all do
there is only 1 path for electrical flow
high resistance
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
This device can open and close a circuit
switch
500
How many poles does a magnet have and what are they called?
2, north and south
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
600
This diagram shows circular magnets on a pencil. What pole is B?
South