Q: Which of the following is the value of the Coulomb constant $$k$$?

$$k = 9.0 \times 10^9$ \ \mathrm{N \cdot m^2$ / C^2$}$$

Question 1

Which of the following best describes the process of charging an object by friction?

Accepted Answer

Electrons are transferred from one object to another when they are rubbed together, resulting in one object becoming positively charged and the other negatively charged.

Question 2

According to the triboelectric series, which material is most likely to become negatively charged when rubbed with glass?

Accepted Answer

Saran Wrap

Question 3

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

Accepted Answer

Negative

Question 4

Which of the following statements about conductors and insulators is correct?

Accepted Answer

In conductors, electrons can move freely from atom to atom, while in insulators, electrons are tightly bound and cannot move freely.

Question 5

Which process allows an object to become charged without direct contact with another charged object?

Accepted Answer

Charging by induction

Question 6

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

Accepted Answer

Positive

Question 7

Which of the following best explains why a charged balloon can stick to a neutral wall?

Accepted Answer

The wall becomes polarized, and the opposite charges are attracted to the balloon.

Question 8

Two identical metal spheres, A and B, are touching. Sphere A has a charge of $$-Q$$ and sphere B is neutral. What is the final charge on each sphere after they are separated?

Accepted Answer

Each sphere has a charge of $$-\frac{Q}{2}$$

Question 9

Which equation correctly represents 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 10

If the distance between two point charges is doubled, what happens to the magnitude of the electrostatic force between them?

Accepted Answer

It becomes one-fourth as large

Question 11

A proton ($$q = +1.6 	imes 10$$^{-19}$$ C) is at the origin, and an electron (q = -1.6$$ 	imes $$10^{-19} C) is at$$ $$(x=2, y=2) m. $$What is the distance $$r$$ between them?

Accepted Answer

$$r = \sqrt{2^2$ + 2^2$} = 2.83 m$$

Question 12

Which of the following is the value of the Coulomb constant $$k$$?

Accepted Answer

$$k = 9.0 	imes 10^9$ \ \mathrm{N \cdot m^2$ / C^2$}$$

Question 13

Which of the following best describes polarization in a dielectric material?

Accepted Answer

The centers of positive and negative charge are shifted slightly apart, creating a dipole moment.

Question 14

Which real-world scenario is most likely to involve triboelectric charging?

Accepted Answer

Rubbing a balloon on your hair and sticking it to a wall.

Question 15

Which of the following is NOT a correct statement about Coulomb’s Law?

Accepted Answer

The force is always attractive, regardless of the sign of the charges.

Question 16

A glass rod is rubbed with silk. According to the triboelectric series, what is the charge on the glass rod after rubbing?

Accepted Answer

Positive

Question 17

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

Accepted Answer

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

Question 18

Which of the following is the correct formula for the gravitational force between two masses $$m_1$$ and $$m_2$$ separated by a distance $$r$$?

Accepted Answer

$$F = G \frac{m_1$ m_2$}{r^2$}$$

Question 19

Which of the following is a key difference between charging by induction and charging by friction?

Accepted Answer

Charging by induction does not require direct contact between objects, while charging by friction does.

Electric Charge, Charging Methods, and Coulomb’s Law

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