$$e = 1.60 \times 10$$^{-19}$$ \ \mathrm{C}$$

Question 1

Which of the following statements best describes the difference between conductors and insulators?

Accepted Answer

Conductors allow electric charges to move freely, while insulators restrict the movement of electric charges.

Question 2

Which equation correctly expresses the quantization of electric charge?

Accepted Answer

$$q = ne$$

Question 3

A glass rod is rubbed with silk and becomes positively charged. What happens to the electrons during this process?

Accepted Answer

Electrons are transferred from the glass rod to the silk.

Question 4

Which of the following is NOT a fundamental force in nature?

Accepted Answer

Friction

Question 5

What is the elementary charge of a proton?

Accepted Answer

$$e = 1.60 	imes 10$$^{-19}$$ \ \mathrm{C}$$

Question 6

If a neutral atom has 15 protons, how many electrons does it have?

Accepted Answer

15

Question 7

Which of the following materials is a good example of a semiconductor?

Accepted Answer

Silicon

Question 8

What happens to the net charge of a closed system according to the law of conservation of charge?

Accepted Answer

It remains constant.

Question 9

A negatively charged rod is brought near a small metal ball suspended by a thread. What happens to the electrons in the metal ball?

Accepted Answer

They move away from the rod, leaving the side near the rod positively charged.

Question 10

Which of the following best explains why the human body is considered a conductor?

Accepted Answer

Free electrons in the body can move toward a charged object, allowing charge transfer.

Question 11

What is the purpose of grounding a positively charged object?

Accepted Answer

To allow electrons from the ground to neutralize the positive charge.

Question 12

Which of the following is true about the charge of a neutron?

Accepted Answer

It is zero.

Question 13

Which phenomenon is a direct result of the Earth's magnetic field interacting with charged particles from the Sun?

Accepted Answer

Aurora (Northern and Southern Lights)

Question 14

Which of the following best describes the process of polarization in an insulator when a charged object is brought near?

Accepted Answer

Atoms become polarized, but there is no net charge separation.

Question 15

A metal cup is initially uncharged. If a positively charged rod is brought near (but not touching) the cup, what happens to the electrons in the cup?

Accepted Answer

Electrons move toward the side of the cup closest to the rod.

Question 16

Which of the following is the correct definition of a coulomb?

Accepted Answer

The amount of charge transferred by a current of 1 ampere in 1 second.

Question 17

Which of the following is a property of a superconductor?

Accepted Answer

No resistance to the movement of charge.

Question 18

If the net charge of a system is $$-3.2 	imes 10$$^{-19}$$ \ \mathrm{C}$$, how many excess electrons does the system have?

Accepted Answer

2

Question 19

Which of the following best describes the behavior of a neutral atom?

Accepted Answer

It contains equal numbers of protons and electrons.

Question 20

Which of the following is a real-world application of the principle of grounding?

Accepted Answer

Lightning rods on buildings

Electric Charge and Electrostatics: Foundations and Applications

Study Guide - Practice Questions