In Class Electrostatics Review

Insulators are different than conductors in that insulators ____.

• do not contain electrons or protons 
•  do not contain any charge
• have a weaker affinity for electrons 
• do not allow charge to freely move 

A glass rod becomes positively charged when it is rubbed with silk. This net positive charge accumulates because the glass rod

• gains electrons
• loses electrons
• gains protons
• loses protons

When a plastic rod is rubbed with wool, the wool acquires a positive charge because

• protons are transferred from the wool to the rod
• protons are transferred from the rod to the wool
• electrons are transferred from the rod to the wool
• electrons are transferred from the wool to the rod

Metal sphere A has a charge of +12 elementary charges and identical sphere B has a charge of +16 elementary charges. After the two spheres are brought into contact and separated, the charge on sphere A is

• +14 elementary charges
• +28 elementary charges
• +2 elementary charges
• -2 elementary charges

When an object gains electrons it becomes __________

• Neutral

• Positively charged

• Negatively charged

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

After a balloon is rubbed against wool, the two objects will ________ each other because they have ___________ charges

• attract; like

• attract, opposite

• repel; like

• repel; opposite

What method of static charging is shown in this picture

• Contact

• Friction

• Grounding

• Electron Shifting

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

Electric charges that are alike _______ each other.

• Attract
• Repel