Electrostatics

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.MS-PS2-3

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 

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

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, 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

• must be positive

• must be negative

• may be neutral or negative

• may be neutral or positive 

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

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

Which of the following is a false statement about electrostatic force.

• Bringing charges closer together strengthen the force.

• The electrostatic constant remains the same.

• The values of the two charges is always the same.

• Electrostatic force can be attractive or repulsive

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

Two like charges

•  neutralize each other.

• repel each other. 

• must be neutrons. 

• attract each other.

Tags

NGSS.MS-PS2-3

When a balloon is rubbed on clothes it acquires a charge by ___________

• Induction

• reduction

• friction 

• concuction