Static Electricity

A negatively charged plastic comb is brought close to, but does not touch, a small piece of paper. If the comb and the paper are attracted to each other, the charge on the paper

• may be positive or neutral

• must be positive

• may be negative or neutral

• must be negative

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

An electroscope is a device with a metal knob, a metal stem, and freely hanging metal leaves used to detect charges. The diagram below shows a positively charged leaf electroscope.

As a positively charged glass rod is brought near the knob of the electroscope, the separation of the leaves will

• remain the same

• increase

• decrease

Tags

NGSS.HS-PS2-4

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, what is the charge on sphere A?

• -2 elementary charges

• +14 elementary charges

• +28 elementary charges

• +2 elementary charges

The diagram above shows three neutral metal spheres, x, y, and z, in contact and on insulating stands. Which diagram best represents the charge distribution on the spheres when a positively charged rod is brought near sphere x, but does not touch it?

• 
• 
• 
• 

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 

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

which is the field for opposite charges

• 
• 
• 
• 

Tags

NGSS.HS-PS2-4

If the distance between two charges doubles, what happens to the force between them?

• Reduced by half
• Reduced by 1/4
• Stays the same
• Quadruples

Tags

NGSS.HS-PS2-4

At which point is the electric field the strongest

• A
• B
• C
• D

Tags

NGSS.HS-PS2-5