Question 1

Which of the following statements best describes the process of charging by friction as explained in the charge model?

Accepted Answer

Charging by friction adds or removes electrons from an object, resulting in a net charge.

Question 2

A plastic rod is rubbed with wool and then brought near small pieces of paper. The paper leaps up and sticks to the rod. What is the best explanation for this phenomenon?

Accepted Answer

The rod is negatively charged and induces a polarization in the neutral paper, resulting in attraction.

Question 3

Which of the following is the SI unit of electric charge?

Accepted Answer

coulomb

Question 4

What is the alteration of space around a charge called?

Accepted Answer

Electric field

Question 5

Which statement correctly describes conductors and insulators?

Accepted Answer

Conductors are materials through or along which charge moves easily.

Question 6

Coulomb's law states that the electric force between two point charges is:

Accepted Answer

Inversely proportional to the square of the distance between them.

Question 7

If a glass rod rubbed with silk is positively charged, what charge does a plastic rod rubbed with wool acquire?

Accepted Answer

Negative

Question 8

A neutral object is brought near a charged rod. What force is observed between them?

Accepted Answer

An attractive force is observed.

Question 9

Which of the following best explains why metals are good conductors?

Accepted Answer

Metals have outer electrons that are weakly bound and free to move throughout the solid.

Question 10

What is charge quantization?

Accepted Answer

The property that charge is always an integer multiple of the fundamental unit of charge $$e.$$

Question 11

Which equation correctly expresses Coulomb's law for the magnitude of the force between two point charges $$q_1$$ and $$q_2$$ separated by a distance $$r$$?

Accepted Answer

$$F = K \frac{q_1$ q_2$}{r^2$}$$

Question 12

A positively charged rod is brought near a neutral metal sphere. What happens to the charges in the sphere?

Accepted Answer

Electrons in the sphere are attracted toward the rod, causing polarization.

Question 13

Which of the following best describes the process of discharging a charged metal object?

Accepted Answer

Touching the object to allow excess charge to spread over a larger conductor.

Question 14

If two identical rods are rubbed with wool and brought close together, what force do they experience?

Accepted Answer

A long-range repulsive force.

Question 15

Which of the following is true about the charges of protons and electrons?

Accepted Answer

Protons and electrons have charges of opposite sign but exactly equal magnitude.

Question 16

A rod attracts a positively charged hanging ball. The rod is:

Accepted Answer

Negatively charged.

Question 17

What happens when a charged plastic rod touches a neutral metal sphere?

Accepted Answer

The metal sphere acquires the same type of charge as the plastic rod.

Question 18

Which of the following best describes the behavior of charges in an insulator?

Accepted Answer

Electrons are tightly bound to nuclei and cannot move freely.

Question 19

When a neutral object is brought near a charged rod, what is the net effect on the neutral object?

Accepted Answer

It becomes charged by induction and is attracted to the rod.

Question 20

Which of the following is NOT a postulate of the charge model described in the study materials?

Accepted Answer

Charge can be created or destroyed in ordinary processes.

Chapter 22: Electric Charges and Forces – Fundamental Concepts and Experimental Foundations

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