Particles and Charges
Static Electricity
E.M.
Charges
Review
100
What material allows electrical charges to move freely?
Give two examples for a double click.
a conductor
any metal or carbon
100
What are materials, often made of silicon, that conduct charges better than insulators, but not as well as conductors? They are used to control the flow of charge.
semiconductors
100
What do we call an iron ore wrapped with electric wire?
an electromagnet
100
Any material that attracts iron or attracts any material made of iron is:
a magnet
100
Give the speed of each line from fastest to slowest.
[Double click to tell which went furthest.]
blue - fastest green - next fastest orange - next fastest purple - slowest
Orange went farthest (150m).200
Which picture below shows the domains of a magnet?
C
200
Where is the magnetic force the strongest?
B
200
As two charged particles move toward each other, what will happen to the electromagnetic field between them?
It will get stronger.
200
Regions at the end of a magnet where the field is strongest are called __.
magnetic poles
200
How equation will solve this problem?
Little Herbie ran into the Jungle Gym with an acceleration of 3 m/s and produced a force of 120 N. What was Little Herbie's mass?
[double click to solve it] Remember the unit for mass.
mass = force / acceleration
mass = 120/3
mass = 40 kg
300
Identify each of the particles in this Lithium atom.
[double click if you give the charges for each]
Red proton positive charge
Yellow neutron neutral charge OR no charge
Small blue electron negative charge
300
Tell which picture is carged by conduction, by friction and by induction.
First picture: friction
Second picture: conduction
Third picture: Induction (Its just close to the wall.)
300
Electrons move in three ways: friction, ____, and ____. (One click for each correct answer.)
friction, contact, and induction
300
The strength of the magnet depends of the number of aligned magnetic ___ and the distances between them.
domains
300
What equation will solve this problem?
f = ma
400
As shown in the picture, magnets exert forces on each other and are surrounded by a:
magnetic field
400
What part of the Earth protects us from the solar wind and cosmic rays? 90
the magnetic field
400
Which two pictures show the movement of charged ping pong balls?
B and C
400
What charge will the top of the cloud receive?
positive
The top will receive a positive charge because it has lost electrons to the warmer, wetter air below.
400
What is the answer? [remember the unit of measurement]
1,125 N
500
What statement correctly describes electromagnetic interactions?
A. Like charges repel; unlike charges attract.
B. Unlike charges repel; Like charges attract.
C. Usually all charges attract.
D. Unlike charges repel unless there is a change in the number of protons.
A. Like charges repel; unlike charges attract.
500
If this Helium atom loses an electron what will be its charge?
+1 It starts with a neutral charge and loses a . negative charge, so it becomes positive (+1).
500
Most of the particles from the Sun are deflected by the Earth's ___ ___.
magnetic field
500
Which of the following correctly shows a magnetic field?
A
500
What does each line show on this distance - time graph?
blue - constant, fast speed
purple - increasing speed OR acceleration
orange - constant speed, stops, returns to stop
green - slow, constant speed