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Types of Charging
What's the Charge?
Electron Affinity
Miscellaneous
100
In the electrophorus experiment, you rubbed the styrofoam with the wool to create a charge. What type of charging is this?
Charging by friction
100
Two positive objects are placed next to each other. Will they attract or repel?
Repel
100
In a wool and comb experiment, which will become positive? Which will become negative? 
Wool = positive

Comb = negative

100
What is the difference between a conductor and an insulator?
Conductors allow electrons to flow and insulators do not. 
200
The van de graaff is an example of what type of charging?
charging by conduction
200
Two objects attract each other. What are their charges?
Positive and negative

Positive and neutral

Negative and neutral

200
Why did the styrofoam become negative in the electrophorus experiment? 
Electrons transferred from the wool because the wool has a lower affinity than styrofoam. 
200
Why does the "human chain" work with the van de graaff? Why can all students feel the shock?
Humans are conductors. 
300

In the electrophorus experiment, you bring your finger near the pie pan when it was on the styrofoam and it shocked you. When you picked it up, the pie pan was positively charged. What type of charging is this?

Charging by induction 
300
Balloon A and Balloon B attract. Balloon B and Balloon C repel. If Balloon B is negative, what is the charge on Balloon A and Balloon C? 
A is positive or neutral. C is negative
300
What does the term affinity mean?
An objects "want" for electrons
300
Why should you not get back in your car when pumping gas?
Electrons (charging by friction) enter your body and would then spark when you touch the metal of the gas pump.
400
Explain the process of grounding and give a good example of a "ground." 
Uncharging something. Excess electrons go to a big object that can take on those excess electrons easily. 
400
Balloon A and B attract. Balloon A and C repel. If balloon B is negative, what are the charges on balloon A and C? 
Balloon A is positive. Balloon C is positive. 
400
Which is more likely to become positively charged? An object with a high affinity or an object with a low affinity? 
An object with a low affinity
400
When you rub a balloon against your hair and hold it up, why would it make your hair stand up? 
Charging by friction creates opposite charges, so your hair would be positive and the balloon negative and they are attracting each other.
500
True or false. Polarization can charge an object either positively or negatively. 
False polarizing an object does not charge an object, it just separates the charges. 
500
Balloon X is negative. Balloon X and Balloon Y attract each other. Balloon Y also attracts Balloon Z. What are the charges on Balloon Y and Balloon Z?
Balloon Y is positive or neutral. Balloon Z is negative, positive, or neutral. 
500
If neutral rabbit fur (low affinity) is rubbed against a neutral rubber rod, what will happen? *Be sure to explain the process as well as the final charges on each object. 
Electrons from the fur will transfer to the rubber rod. The rubber rod will become negative and the fur will become positive. 
500
What is a triboelectric series?
a list of materials rated by their electron affinity