Transcript Q $100 Q $200 Q $300 Q $400 Q $500 Q $100 Q $100 Q $100 Q

Electricity Jeopardy
Electric Fields
Electrostatics and Potential
Coulomb’s
Law
Extra problems
and comparing
Feand Fg
Extra
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Final Jeopardy
$100 Electrostatics
How can you create a
positive charge?
$100 Answer Electrostatics
Take away the electrons so only the
protons are left behind.
$200 Electrostatics
What is the difference between a conductor and an
insulator?
$200 Answer Electrostatics
Conductors have “free” electrons but insulators have tightly bound
electrons. This means that conductors allow electrons to move
through them easily, insulators do not.
$300 Electrostatics
When charges separate themselves due to
charging by polarization, how does this happen?
$300 Answer Electrostatics
A charged object is brought near an uncharged object
$400 Electrostatics
What are the 3 ways to charge an
object? Give an example of each one.
$400 Answer Electrostatics
Friction
Conduction
Polarization
$500 Electrostatics
What type of charging
is occurring in a clothes
dryer? Why do we use
dryer sheets?
$500 Answer Electrostatics
Friction and conduction.
In the dryer the clothes rub together, transferring electrons.
The dryer sheet is used to take away any extra charge.
$100 Question Electric Fields
If you walk into a region of space and suddenly feel a force, the
space is said to contain a ____________.
a) Black hole
b) Charged object
c) Force field
d) Heavy object
e) Large charge
$100 Answer Electric Fields
c) Force field
$200 Question Electric Fields
If this were a hollow object with a build up of negative charge, draw
how the charge would distribute it self inside and explain what you
draw.
$200 Answer Electric Fields
Charges spread out and bunch up
at the corners.
$300 Question Electric Fields
Draw the electric field lines between a positive
and a negative charge.
$300 Answer Electric Fields and
Potential
$400 Question Electric Fields
and Potential
Draw a diagram of the electric
field lines between two similar
positive charges.
$400 Answer Electric Fields and
Potential
$500 Question Electric Fields
and Potential
Why are you safe in a lighting storm
If you are sitting in your car?
$500 Answer Electric Fields and
Potential
The car acts like a faraday cage. All of the charge gathers on
the outside of the car keeping you safe.
$100 Question Coulomb
Which tends to be a stronger force,
gravitational force or electrostatic force?
$100 Answer Coulomb
Electrostatic Force
$200 Question Coulomb
If you quadruple the distance
between two charges, what
happens to the electrostatic
force?
$200 Answer Coulomb
The force decreases…
Specifically,
Reduced by a factor of 16
$300 Question Coulomb
What will happen to the force
between two charges if the distance
remains the same, but the amount of
charge increases?
$300 Answer Coulomb
The overall force will increase
$400 Question Coulomb
What is the electrostatic force
between two negative charges of
0.098 C separated by a distance
of 5 meters? Is it attractive or
repulsive?
$400 Answer Coulomb
3.5 x 106 N repulsive force
$500 Question Coulomb
What is the electrostatic force
between a proton and an
electron separated by a
distance of 7 x 10-8 N?
$500 Answer Coulomb
4.7 x 10-14 N
$100 Question Extra
What are the charged
parts of the atom?
$100 Answer Extra
Electrons and protons
$200 Question Extra
What does the symbol q represent
in Coulomb’s Law equation?
What are the units for q?
$200 Answer Extra
q represents Charge of an object
C (coulomb’s) are the unit of charge
$300 Question Extra
What does the
symbol k represent?
$300 Answer Extra
k represents a constant
k = 9 x 109
$400 Question Extra
Why did the pieces of paper fly off
of the Van der Graaff Generator?
$400 Answer Extra
They were being repelled.
The charges were similar.
$500 Question Extra
Create an example
problem.
$500 Answer Extra
$100 Question Extra
Why will your hair stand up when you hold onto the
Van de Graff generator.
$100 Answer Extra
Electrons build up even in your hair and
the electrons repel each other.
$200 Question Extra
What type of charging causes the plastic on a CD to stick to you
when you first unwrap the CD?
$200 Answer Extra
Friction
$300 Question Extra
A positive object ____________ (gains/loses) electrons.
$300 Answer Extra
Loses
$400 Question Extra
Why shouldn’t you get in and out of your car
when you pump gas?
$400 Answer Extra
You can charge yourself by friction when you slide in and out and then
arc to the gas when you go to take the pump out of the tank. FIRE!
$500 Question Extra
Why doesn’t it hurt you to have static charge built up on you?
What actually hurts you when you get electrocuted?
$500 Answer Extra
The transfer of electrons
is what hurts you
Final Jeopardy
A 3kg sphere with a charge of +3 x 10-4 C is placed 0.7m from a 5kg
sphere with a charge of +4 x 10-7 C. Calculate all the forces (this
means electric force and gravitational force) present and draw a force
diagram of the forces. Which force is bigger?
Final Jeopardy Answer
Fg = 2.04x10-9N
Fe= 2.2 N
Fg = 2.04x10-9N
Fe is much greater
Fe = 2.2N