Question 1

A positively charged rod is brought near an uncharged aluminum can that is free to roll on a table. What happens to the can, and why?

Accepted Answer

The can is attracted because negative charges are induced on the side closest to the rod.

Question 2

Two charged rods, one positive and one negative, are placed at equal distances on either side of an uncharged aluminum can. What is the net force on the can?

Accepted Answer

The net force is zero because the attractive forces are equal and opposite.

Question 3

If a negatively charged rod briefly touches an aluminum can and is then removed, what is the resulting behavior of the can when placed between a positive and a negative rod?

Accepted Answer

The can is attracted to the positive rod due to its net negative charge.

Question 4

A test charge is brought near a neutral insulator and a neutral conductor. Which statement best describes the forces experienced?

Accepted Answer

The insulator experiences a weak attraction, while the conductor experiences a strong attraction.

Question 5

Given three balls: A (strongly attracts a positive test charge), B (strongly repels), C (weakly attracts), and D (strongly attracts, copper). What is the charge on ball B?

Accepted Answer

Negative

Question 6

What is the nature of the force between a positively charged ball A and a neutral insulating ball C?

Accepted Answer

Weakly attractive due to polarization

Question 7

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

Accepted Answer

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

Question 8

A small metal ball is repeatedly given a negative charge and touched to end A of a long insulating rod. What happens to the charge distribution?

Accepted Answer

Negative charge accumulates at end A, with end B remaining nearly neutral.

Question 9

A glass marble is rubbed against silk, and the silk acquires extra electrons. What happens to the marble?

Accepted Answer

It acquires a positive charge and attracts the silk.

Question 10

Three charges are placed at the corners of an equilateral triangle. Two are negative and one is positive. What is the direction of the net force on the positive charge?

Accepted Answer

Toward the midpoint between the two negative charges

Question 11

If two small spheres are spaced 20.0 cm apart and have equal charge, and the repulsive force between them is $$4.57 	imes 10$$^{-21}$$ N, how many excess electrons are on each sphere? (Charge of electron e = 1.60$$ 	imes $$10^{-19} C)$$

Accepted Answer

About $$891$$ electrons

Question 12

A test charge is brought near a neutral copper ball. What is the nature of the force and why?

Accepted Answer

Strong attraction due to induced polarization.

Question 13

Which of the following is NOT one of the four fundamental forces?

Accepted Answer

Normal force

Question 14

A small object with charge $$q$$ and mass $$m is $$projected into a uniform electric field $$E$$ and is deflected vertically by $$d$$ after traveling a horizontal distance $$L. $$What is the charge-to-mass ratio $$\frac{q}{m}$$?

Accepted Answer

$$\frac{q}{m} = \frac{2 d E}{L v_0$^2}$$

Question 15

Which menu icon in a Pearson eText would you use to view all your bookmarks?

Accepted Answer

Table of contents icon

Question 16

When a negatively charged ball is brought near end A of a conducting rod, what happens to the charges in the rod?

Accepted Answer

Positive charges are induced at end A, negative at end B.

Question 17

After a conducting rod is repeatedly touched with a negatively charged ball at end A, how is the charge distributed when the ball is far away?

Accepted Answer

Negative charge is spread evenly over the rod.

Question 18

Which of the following best describes the force between two like charges according to Coulomb's Law?

Accepted Answer

Repulsive and proportional to $$\frac{1}{r^2$}$$

Electrostatics: Charged Rods, Conductors, and Insulators

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