Coulomb's Law and Static Charging

When the electroscope is charged by touching it with a charged object, this is called ____.

• charging by conduction

• charging by induction

• energizing

• grounding

When the electroscope is charged (temporarily) by bringing a charged object near, this is called ____.

• charging by conduction

• charging by induction

• energizing

• grounding

A negatively charged rod is brought near a neutral electroscope, what happens in the electroscope?

• Electrons move from the plate to the vein to make the vein negatively charged.

• Protons move from the plate to the vein to make the vein positively charged.

• Electrons move from the vein to the plate to make the vein positively charged.

• Protons move from the vein to the plate to make the vein negatively charged.

A positively charged rod is brought near a neutral electroscope, what happens in the electroscope?

• Electrons move from the plate to the vein to make the vein negatively charged.

• Protons move from the plate to the vein to make the vein positively charged.

• Electrons move from the vein to the plate to make the vein positively charged.

• Protons move from the vein to the plate to make the vein negatively charged.

A positively charged rod touches the plate of a neutral electroscope, what happens in the electroscope?

• Electrons move from the rod to the plate and to the vein to make the vein negatively charged.

• Protons move from the rod to the plate and to the vein to make the vein positively charged.

• Electrons move from the vein to the plate and to the rod make the vein positively charged.

• Protons move from the vein to the plate and to the rod to make the vein negatively charged.

During a physics lab, a plastic strip was rubbed with cotton and the cotton became negatively charged. The correct explanation for why the cotton becomes negatively charged is that ...

• the plastic strip acquired extra protons from the cotton.

• the plastic strip acquired extra protons from the charging process. 

• electrons were created as the result of the charging process

• the plastic strip lost electrons to the cotton during the charging process.

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

An electrostatic force F_E exists between two charges. If both charges are halved, and the distance between them is doubled, what would be the new electrostatic force between the charges?

• 1/4 F

• 4F

• 1/8F

• F or same

Which of the following is not true about Electrostatic Force, F_E?

• It is directly proportional to the magnitude of the charges

• It is inversely proportional to the square of the distance between charges

• It can be repulsive or attractive.

• It increases as the distance between the charges increases.

Based on the triboelectric series, wool would ________ electrons when rubbed against Teflon.