Question 1

Which of the following statements best describes the process of charging by friction?

Accepted Answer

It involves transferring charge from one object to another by rubbing, resulting in one object gaining electrons and the other losing electrons.

Question 2

According to the triboelectric series, what is the expected charge on a glass rod after being rubbed with silk?

Accepted Answer

The glass rod becomes positively charged.

Question 3

Which material is most likely to gain electrons when rubbed with nylon, based on the triboelectric series?

Accepted Answer

Saran Wrap

Question 4

A negatively charged rod is brought near a neutral metal sphere that is insulated from the ground. What happens to the charges in the sphere?

Accepted Answer

Electrons in the sphere move away from the rod, making the side near the rod more positive.

Question 5

Which of the following best describes a conductor?

Accepted Answer

A material in which electrons can move freely from one atom to another.

Question 6

What is the main difference between charging by induction and charging by friction?

Accepted Answer

Induction does not require direct contact, while friction does.

Question 7

A neutral insulator is brought near a negatively charged rod. What happens to the charges in the insulator?

Accepted Answer

The insulator becomes polarized, with the near side becoming slightly positive and the far side slightly negative.

Question 8

Which equation correctly expresses Coulomb’s Law for the magnitude of the force between two point charges?

Accepted Answer

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

Question 9

If two identical metal spheres, one with charge $$-Q$$ and one neutral, touch and are then separated, what is the final charge on each sphere?

Accepted Answer

$$-Q/2 on $$each sphere

Question 10

A proton is placed at the origin and an electron is placed at $$(x=2, y=2)$$ meters. What is the direction of the electric force on the electron due to the proton?

Accepted Answer

Toward the origin, along the vector $$\langle -1, -1 \rangle$$

Question 11

Which of the following is the value of the elementary charge $$|q_e|$$?

Accepted Answer

$$1.6 	imes 10$$^{-19}$$ C

Question 12

Which of the following best explains why NASA may cancel a rocket launch if the vehicle is expected to pass through certain clouds?

Accepted Answer

Charge buildup due to triboelectrification can interfere with electronics and communications.

Question 13

Which of the following is NOT a property of conductors?

Accepted Answer

They do not allow electrical charges to move.

Question 14

What is the value of the Coulomb constant $$k in SI $$units?

Accepted Answer

$$9.0 	imes 10^9$ N m^2$/C^2$

Question 15

Which of the following scenarios best illustrates polarization?

Accepted Answer

A neutral insulator develops a slight separation of charge when a charged rod is brought near.

Question 16

Which of the following is the correct expression for the force between two charges $$q_1$$ and $$q_2$$ separated by a distance $$r in $$vector form?

Accepted Answer

$$\vec{F} = k \frac{|q_1$||q_2$|}{r^2$} \hat{r}$$

Question 17

Which of the following is true about the forces between two point charges according to Coulomb’s Law?

Accepted Answer

The forces are equal in magnitude and opposite in direction.

Question 18

A plastic rod is rubbed with fur. According to the triboelectric series, what is the resulting charge on the plastic rod?

Accepted Answer

The plastic rod becomes negatively charged.

Question 19

Which of the following best describes an insulator?

Accepted Answer

A material in which electrical charges are not free to move.

Electric Charge, Charging Methods, and Coulomb’s Law

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