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PTR-08 Static Electricity Clicker Questions



Multiple Choice
Identify the choice that best completes the statement or answers the question.
 

 1. 

If current electrcity is like a river, static electricity is more like
a.
Water vapor (water in gaseous form)
c.
A lake
b.
Ice
d.
The collective works of Emily Dickinson
 

 2. 

d in Coulomb’s law is
a.
the meters between two charges
c.
the universal constant (Coulomb’s constant)
b.
distance between object and image
d.
the charge on an object
 

 3. 

All the choices below except one list a true similarity between gravity and static electricity. Which one is that exception?
a.
Both of these represent either attractive forces, or repulsive forces
d.
A universal constant is used to compute the force of gravity and a universal constant also allows the computation of electrical forces
b.
A single mass or charge can define a field
e.
Forces decrease with distance squared
c.
Trick question: There is no “exception” in this list!
 

 4. 

magnets ___________ electrically charged objects
a.
repel
c.
attract
b.
neither attract nor repel
d.
trick question: you can’t tell because you don’t know the charge of the object!
 

 5. 

A joule per coulomb is a measure of
a.
charge
c.
voltage
b.
electrical field strength
d.
electrical potential energy
 

 6. 

mc006-1.jpg
Which set of force vectors reasonably shows the forces at position A?
a.
A
b.
B
c.
C
d.
D
e.
None
 

 7. 

Which of the following is the best place for shielding you from lightning
a.
In a hollow electrical conductor
c.
In a hollow electrical insulator
b.
On a golf course, standing near a tall tree, holding a metal club, talking on a landline phone with your feet in water wearing a t-shirt with writing on it making fun of lightning’s mother
d.
In a low lying area outdoors
 

 8. 

mc008-1.jpg
Which set of force vectors reasonably shows the forces at position A?
a.
A
b.
B
c.
C
d.
D
e.
None
 

 9. 

The mobile atomic particle which is transferred when creating a static charge is
a.
neutron
c.
electron
b.
proton
d.
alpha particle
 

 10. 

A charged balloon sticks to a wooden door. The balloon sticks because it ___________ the individual atoms and molecules of the door.
a.
discharges surplus electrons toward
c.
insulates
b.
polarizes
d.
charges
 

 11. 

An electroscope’s leaves repel when
a.
The electroscope is charged by conduction
d.
The electroscope is charged by induction
b.
a negatively charged object is brought near
e.
all of the above
c.
a positvely charged object touches it
 

 12. 

Two charged particles are 30 cm apart and experience a repulsive force of 200 mN. How far should they be spaced to experience a repulsive force of 400 mN?
a.
15 cm
d.
60 cm
b.
7.5 cm
e.
Trick question: these are all wrong!
c.
120 cm
 

 13. 

A balloon can attract a neutral conductor like a metal can, but cannot attract an insulator
a.
True
b.
False
 

 14. 

The pith ball lab in class showed ____________ then after contact  showed ______________
a.
attraction via polarization, repulsion via being charged
c.
repulsion via being charged, attraction via polarization
b.
charge collection at pointy tips, rubbing off of charges
d.
rubbing off of charges, charge collection at pointy tips
 

 15. 

True or False and why? Metals, like aluminum can be polarized.
a.
True. Only with the transfer of a lot of charge (depending on the thicknness of the aluminum)
d.
False. Being a non-metal, the electrons cannot move so this is impossible as demonstrated in class!
b.
False. Metals cannot be polarized because charge quickly passes through the metal
e.
True. In the presence of an electric field
c.
True. Only in the presence of a magnetic field
 

 16. 

It’s relatively easy to build up charges on the surface of conductors
a.
False
b.
True
 

 17. 

Two charged particles are 30 cm apart and experience a repulsive force of 50 mN. How far should they be spaced to experience a repulsive force of 400 mN?
a.
120 cm
d.
7.5 cm
b.
60 cm
e.
Trick question: these are all wrong!
c.
15 cm
 

 18. 

Which has electrons that easily roam from atom to atom?
a.
Metals
c.
All of the above
b.
Metalloids
d.
Non-metals
 

 19. 

Which of the following is a modern version of something in your camera that allows you to take pictures in dark rooms?
a.
Leyden jar
b.
Faraday cage
c.
Tesla coil
d.
Van de graaff
 

 20. 

mc020-1.jpg
Which set of force vectors reasonably shows the forces at position A?
a.
A
b.
B
c.
C
d.
D
e.
None
 

 21. 

A negatively charge object will attract
a.
positively charged objects
c.
both a and b
b.
neutral (un-charged) objects
d.
none of the above
 

 22. 

Which force is stronger
a.
The force of all machines ever made in the history of mankind
c.
The combined weight of all humans on earth
b.
The force required to keep the electrons in one gram of hydrogen from the protons a distance of 1 m apart
d.
Godzilla when he’s ticked off at Tokyo
 

 23. 

The triboelectric series describes
a.
how well some materials conduct charges compared to other materials
c.
how likely free charges are to remain on some materials comparted to others
b.
the relative amount of charge that can be separated for various materials (“degree of polarization”)
d.
which materials will stick to charged objects, like a negatively charged balloon for example
 

 24. 

If two like charges are 10 m apart, how far must they be to reduce their repulsive force by a factor of 100? (1% of what it was at 10 m)
a.
100 m
c.
1000 m
b.
10 m
d.
1 m
 

 25. 

Which of the following cannot be polarized?
a.
an aluminum can
d.
a pithball
b.
a wooden surface
e.
Trick: they all can!
c.
metal foil
 

 26. 

A negatively charged object is attracted to
a.
neutral insulators
c.
positively charged objects of any kind
b.
neutral conductors
d.
all of the above
 

 27. 

k in Coulomb’s law is
a.
the universal constant (Coulomb’s constant)
c.
the meters between two charges
b.
distance between object and image
d.
the charge on an object
 

 28. 

Cell phones often work poorly in elevators and inside of microwave ovens because
a.
metal conductors overwhelm them with “abundant surface electrons”
c.
these are Faraday cages
b.
voltage drops within hollow metal conductors called the “surface interference”
d.
static charge build up on metal surfaces (where the term “I’m getting a lot of static” comes from)
 

 29. 

When the force from Coulomb’s law is positive that means
a.
No force of attraction or repulsion exists
c.
There is a repulsive force
b.
There is an attractive force
d.
A force exists (can’t tell positive or negative)
 

 30. 

Recall: The name for the fundamental charge is “e”. If 4 electrons are separted from 3 protons by a distance of 25 nm, then the q1 = _______ and q2 = _______.
a.
-4e, 3e
c.
-4, 3
b.
-3, 4
d.
4, 3
 

 31. 

___________ easily build up static charge on their surface.
a.
Water molecules
c.
Conductors
b.
Metalloids
d.
Insulators
 

 32. 

The fundamental charge is 1.60 x 10-19 C. It is possible to have something charged to 4.00 x 10-19 C?
a.
True
b.
False
 

 33. 

Which of the following is “energy per charge”?
a.
Amount of charge, q
d.
None of the above
b.
Force (Coulomb’s law)
e.
Electrical potential energy
c.
Electric field strength
 

 34. 

If the electrical attractive between two charged particles is 10 N when they are 30 cm apart, how close would they have to be for the force to be 90 N?
a.
10 cm
c.
90 cm
b.
30 cm
d.
none of these!
 

 35. 

Electrical force is weak compared to gravitational forces
a.
False
b.
True
 

 36. 

A metal can is attracted to a negatively charged balloon because
a.
electrons with the can flee from the nearby negative charges on the balloon polarizing the can
c.
negative charges easily flow TO the metal can (because it’s an electrical conductor) from the balloon
b.
negative charges easily flow FROM the metal can (because it’s an electrical conductor) onto the balloon
d.
the aluminum atoms themselves become polarized
 

 37. 

A wooden door is attracted to a negatively charged balloon because
a.
electrons with the can flee from the nearby negative charges on the balloon polarizing the wood (carbon) atoms
c.
negative charges easily flow FROM the wood door (because it’s an electrical conductor) onto the balloon
b.
the wood (carbon) atoms themselves become polarized
d.
negative charges easily flow TO the wood door (because it’s an electrical conductor) from the balloon
 

 38. 

When objects become charged without any direct contact with the charged object, this is called
a.
charging by proton transfer
d.
charging by electron transfer
b.
charging by polarization
e.
charging by conduction
c.
charging by induction
 

 39. 

If two charges separated by a distance of 10 m have an attractive force of 50 N, how much for would they feel at 5 m?
a.
200 N
d.
12. 5 N
b.
50 N
e.
25 N
c.
100 N
 

 40. 

What does the symbol “e” represent?
a.
Coulomb’s constant
c.
The charge on a proton
b.
The magnitude of charge on either an electron or proton
d.
The charge on an electron
 



 
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