Electrostatics Review

During a physics lab, a plastic strip was rubbed with cotton and became positively charged. The correct explanation for why the plastic strip becomes positively charged is that ...

• the plastic strip acquired extra protons from the cotton.
  
• the plastic strip acquired extra protons from the charging process 
• protons were created as the result of the charging process
  
• the plastic strip lost electrons to the cotton during the charging process 

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 

Consider the conduction charging shown between the negative rod and the neutral sphere.

• Electrons move from the insulating stand into the sphere.
• Protons move from the bar into the sphere.
• Electrons move from the charged metal bar into the sphere.
• Protons move from the sphere into the negatively charged bar.

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

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

Tags

NGSS.MS-PS2-5

A negatively charged plastic comb is brought close to a small piece of paper. If the comb and the paper are attracted to each other, the charge on the paper

• must be positive
• must be negative
• may be neutral or negative
• may be neutral or positive 

Tags

NGSS.MS-PS2-3

Electrostatic force F exists between two point charges. If the both charges are doubled, the force between the charges will be

• F
• 4F
• 2F
• F/4

Tags

NGSS.HS-PS2-4

What is the name of the particle that is being transferred?

• Proton
• Neutron
• Electron
• Positron

Tags

NGSS.MS-PS1-5

The SI unit of charge is

• the ampere
• the newton
• the coulomb
• the joule

Charge is neither created nor destroyed, but can be rearranged.

• true
• false

Which shows the electric field between two opposite charges?

• 
• 
• 
• 

Tags

NGSS.MS-PS2-3