Hewitt Electrostatics

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

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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

If each of the charges doubles, what happens to the electrostatic force?

• Quadruples

• Doubles

• Stays the same

• Reduced by half

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What is an electric field?

• A region around a charged particle where it experiences a magnetic force.

• A region around a charged particle where it experiences a force due to another charge.

• A region in space where the temperature increases due to electric charge.

• A region in space where sound waves are amplified.

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How does the electric field inside a conductor behave when it is in electrostatic equilibrium?

• It is zero

• It is at its maximum value

• It is directly proportional to the surface charge density

• It oscillates

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 

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NGSS.MS-PS2-3

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.MS-PS2-3