Charge Interactions

Based on this passage, which statement is true of a positively charged object?

• Positively charged objects do not contain any electrons.
•  Positively charged objects do not contain neutrons or electrons. 
• There are more protons than electrons on a positively charged object.
• The protons and the electrons are both positively charged on such objects. 

The passage states that when two objects are rubbed together, there is a transfer of electrons. What seems to be the important variable in determining which object acquires the transferred electrons?  

• The relative size of the two objects
• The relative roughness of the two objects
• The relative affinity that each object has for electrons.
• The number of electrons initially possessed by each object.

Object A - the balloon - is made of vinyl. How does the electron affinity of vinyl compare to that of animal fur? 

• Vinyl has a greater affinity for electrons than animal fur
•  Animal fur has a greater affinity for electrons than vinyl.
• Both vinyl and animal fur has the same affinity for electrons. 
• Nonsense! It is not possible to compare electron affinities with so little information.

It is stated in the passage that Object A is negatively charged. What can be concluded about any object that is observed to attract Object A?

• The object is positively charged
• The object is negatively charged
• The object is electrically neutral
•  The object is either neutral or positively charged

Which observation is the most important observation for determining the charge on Object B? 

• Object B attracts Object C
• Object E attracts Object B.
• Object B was rubbed with animal fur.
•  Object A and Object B repel each other.

What conclusion can be made regarding Object B from the sole observation that Object A and Object B repel each other? 

• Object B is charged with a positive type of charge
• Object B is charged with a negative type of charge
• Object B is charged; more tests must be performed to determine the type of charge it has. 
• Object B is either negatively charged or neutral; additional tests must be performed to be more conclusive.