Charge Model

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

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

A volt is a unit of 

• charge. .
• electric potential. 
• energy. 
• work.

Compared to insulators, metals are better conductors of electricity because metals contain more free

• protons
• electrons
• positive ions
• negative ions

The accumulation of excess electric charge on an object is called

• Static electricity 
• Electric discharge
• Resistance
• Circuit 

The Law of Electrostatics says that objects that have the same charge...

• push away from each other
• pull together
• release nuclear energy
• fall in love

Tags

NGSS.HS-PS2-4

NGSS.HS-PS3-5

Q_A and Q_B are two charges creating an electric field. Based on the electric field lines, we can conclude

• Q_A and Q_B are both positive
• Q_A and Q_B are both negative
• Q_A is positive and Q_B is negative
• Q_A is negative and Q_B is positive

Tags

NGSS.HS-PS2-4

Calculate the force exerted between two charged objects separated by a distance of 0.6 m. One object has a charge of +5 C and the other has a charge of +2.0 C.

• 1.5E-11 N

• 3.5E-11 N

• 2.5E11 N

• 7.5E-10 N

Tags

NGSS.HS-PS2-4