Electrostatics

An atom of oxygen has 8 protons and 10 electrons, this means the atom is ____________

• positively charged because it has excess electrons

• negatively charged because it has excess electrons

• positively charged because it has a deficiency of electrons

• negatively charged because it has a deficiency of electrons

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 is a lack of electrons on a positively charged object.

• The protons and the electrons are both positively charged on such objects.

When a charged object contacts another object (one is usually a conductor), there is a transfer of electrons. How do you determine which object acquires the transferred electrons?

• Always transfer from the bigger to the smaller object, to make it even

• Transfer is based on the initial charge of the two objects

• Transfer is based on how much electron affinity that each object has

• Always transfer from the more negative to the more positive object

After grounding, how will objects interact?

• Both will have the same charge, so they attract one another

• Both will be neutral, so they will attract one another

• Botn will be neutral, so they will repel one another

• Both will be neutral, so they will not attract nor repel

Examine Before and After picture. Why do electrons move the way they did?

• This is grounding - electrons want to even out

• This is charging by contact - electrons go to the larger object

• This is charging by contact - electrons go from the object with less e- affinity to more e- affinity.

• This is charging by contact - electrons want to even out

Two like charges

•  neutralize each other.
• repel each other. 
• must be neutrons. 
• attract each other.

Rubber¸ plastic¸ glass and dry air are the examples

of

• conductors

• Insulators

Materials that allow electrons to flow freely across the entire surface are known as __________________.

• conductors

• insulators

Which of the following is not a good conductor of electricity?

• copper
• silver
• Glass
• aluminum

Which of the following is not a good insulator?

• Copper
• Glass
• rubber
• wool