Charging

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 during 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.

Saran Wrap has a larger electron affinity than Nylon. If Nylon is rubbed against Saran Wrap, which would end up with the excess negative charge? ____________

• Saran Wrap

• Nylon

A physics teacher rubs a glass object and a felt cloth together and the glass becomes positively charged. Which of the following statements are true? Check all that apply.

• The felt became charged negatively during this rubbing process.

• If the glass acquired a charge of +5 units, then the felt acquires a charge of -5 units.

• This event violates the law of conservation of charge.

• Electrons are transferred from glass to felt; protons are transferred from felt to glass.

• Once charged in this manner, the glass object and the felt cloth should attract each other.

Tags

NGSS.HS-PS3-5

Which statement best explains why a rubber rod becomes negatively charged when rubbed with fur?

• The rubber that the rod is made of is a better insulator than fur.

• The fur is a better insulator than the rubber.

• Molecules in the rubber rod have a stronger attraction for electrons than the molecules in the fur.

• Molecules in the fur have a stronger attraction for electrons than the molecules in the rubber rod.

Tags

NGSS.MS-PS1-1

A neutral metal sphere is touched by a negatively charged metal rod. As a result, the sphere will be ____ and the metal rod will be ____.

• positive, negative

• positive, positive

• negative, positive

• negative, negative

• neutral, positive

Tags

NGSS.HS-PS2-4

A neutral metal sphere is touched by a negatively charged metal rod. During the process, electrons are transferred from the _____ to the _____ and the sphere acquires a _____ charge.

• neutral sphere, charged rod, negative

• neutral sphere, charged rod, positive

• charged rod, neutral sphere, negative

• charged rod, neutral sphere, positive

• ... nonsense! None of these describe what occurs.

A neutral metal sphere is touched by a positively charged metal rod. During the process, protons are transferred from the _____ to the _____ and the sphere acquires a _____ charge.

• charged rod, neutral sphere, negative

• charged rod, neutral sphere, positive

• neutral sphere, charged rod, negative

• neutral sphere, charged rod, positive

• . ... nonsense! None of these describe what occurs.

Tags

NGSS.HS-PS2-4

NGSS.HS-PS3-5

A metal sphere is electrically neutral. It is touched by a positively charged metal rod. As a result, the metal sphere becomes charged positively. Which of the following occur during the process? Check all that apply.

• The metal sphere gains some protons.

• Electrons are transferred from the sphere to the rod.

• The metal sphere loses electrons.

• The overall charge of the system is conserved.

• Protons are transferred from the rod to the sphere.

Tags

NGSS.HS-PS2-4

NGSS.HS-PS3-5

A positively charged pop can is touched by a person standing on the ground. The pop can subsequently becomes neutral. The pop can becomes neutral during this process because ______.

• electrons pass from the pop can to the person (ground)

• electrons pass from the person (ground) to the pop can

• protons pass from the pop can to the person (ground)

• protons pass from the person (ground) to the pop can

A physics student, standing on the ground, touches an uncharged plastic baseball bat to a negatively charged electroscope. This will cause ___.

• the electroscope to be grounded as electrons flow out of the electroscope.

• the electroscope to be grounded as electrons flow into the electroscope.

• the electroscope to be grounded as protons flow out of the electroscope.

• the electroscope to be grounded as protons flow into the electroscope.

• absolutely nothing (or very little) to happen since the plastic bat does not conduct.