Question 1

Which of the following statements best describes the principle of conservation of charge?

Accepted Answer

The algebraic sum of all electric charges in any closed system is constant.

Question 2

A neutral lithium atom has 3 protons, 4 neutrons, and 3 electrons. If it loses one electron, what type of ion does it become?

Accepted Answer

A positive ion with a charge of $$+1e$$

Question 3

Which material is most likely to act as a good conductor of electricity?

Accepted Answer

Copper

Question 4

When a negatively charged plastic rod is brought near an uncharged metal ball supported by an insulating stand, what happens to the electrons in the metal ball?

Accepted Answer

They are repelled away from the rod.

Question 5

Which of the following best explains why a charged balloon sticks to an uncharged ceiling?

Accepted Answer

The ceiling is polarized, and induced charges create an attractive force.

Question 6

A metal ball is charged by induction using a negatively charged rod and grounding wire. After the process, what is the net charge on the ball?

Accepted Answer

Positive

Question 7

Which of the following equations correctly represents Coulomb's Law for 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 8

If two identical plastic rods are both rubbed with fur and then brought close together, what will happen?

Accepted Answer

They will repel each other.

Question 9

A charged plastic rod attracts small pieces of paper. What is the best explanation for this phenomenon?

Accepted Answer

The paper is polarized, and induced charges cause attraction.

Question 10

Which of the following statements about electric field lines is correct?

Accepted Answer

Electric field lines never cross and point away from positive charges.

Question 11

A sphere with charge $$q = 1.0 \mu C$$ creates an electric field at a distance $$r = 0.50\ m. $$What is the magnitude of the electric field at this distance? (Use $$k = 8.99 	imes 10^9$\ N\cdot m^2$/C^2$)

Accepted Answer

$$E = 3.6 	imes 10^4$\ N/C$$

Question 12

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

Accepted Answer

Conductors allow charge to move freely; insulators do not.

Question 13

A positive ion is formed when:

Accepted Answer

An atom loses one or more electrons.

Question 14

Which of the following is true about the magnitude of the charge of a proton and an electron?

Accepted Answer

Both have the same magnitude of charge but opposite signs.

Question 15

A negatively charged rod is brought near a neutral metal ball, and the ball is then grounded. What is the final charge on the ball after the rod is removed?

Accepted Answer

Positive

Question 16

Which of the following best describes the process of charging by conduction?

Accepted Answer

A charged object touches another object, transferring charge directly.

Question 17

If a glass rod rubbed with silk is brought near a metal ball that was previously charged negatively, what will happen?

Accepted Answer

The ball will be attracted to the rod.

Question 18

Which of the following is a real-world example of polarization?

Accepted Answer

A plastic rod attracting bits of paper after being rubbed with fur.

Question 19

A test charge $$q_0 is $$placed in an electric field $$\vec{E}. $$What is the force experienced by the test charge?

Accepted Answer

$$\vec{F} = q_0$ \vec{E}$$

Question 20

Which of the following best describes the direction of the electric field at a point near a positive charge?

Accepted Answer

The electric field points away from the positive charge.

Chapter 17: Electric Charge and Electric Field – Study Notes

스터디 가이드 - 연습 문제

학습 가이드 - 플래시카드