Electro Static Guided

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. 

• 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.

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.HS-PS1-1

 A balloon is rubbed against a student's hair and then touched to a wall. The balloon sticks to the wall due to

• magnetic forces between the particles of the balloon and the particles of the wall
• electrostatic forces between the particles of the balloon and the particles of the wall
• magnetic forces between the particles of the wall
• electrostatic forces between the particles of the balloon

Tags

NGSS.MS-PS2-3

A negatively charged plastic comb is brought close to a small piece of paper. You observe the paper attracted to the comb. Which can you conclude is stronger, the electrical force between comb and paper or the gravitational force between paper and earth?

• the electrical force

• the gravitational force

• they are equal

• not enough information to answer

Tags

NGSS.HS-PS2-4

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

Tags

NGSS.HS-PS1-1

A positively charged rod is held near the knob of a neutral electroscope. What best describes what will happen to the leaves?

• the leaves will spread apart and be positive
• the leaves will spread apart and be negative
• the leaves will stay closed and be positive
• the leaves will stay closed and be negative

Two electrically neutral metal spheres, A and B, on insulating stands are placed in contact with each other. A negatively charged rod is brought near, but does not touch the spheres, as shown in the diagram below. How are the spheres now charged?

• A is positive and B is positive.
• A is negative and B is positive.
• A is positive and B is negative.
• A is negative and B is negative.

Three charged metal spheres, X, Y, and Z, are on insulating stands. All three spheres are simultaneously brought into contact with each other and then returned to their original positions.
Which statement best describes the charge of the spheres after this procedure is completed?

• All the spheres will end up with the same charge
• All the spheres are neutral
• Sphere Y has a greater charge than spheres X or Z
• Each sphere retains the same charge that it had originally

Tags

NGSS.HS-PS3-5