PHYS 112 QUIZ 1+2

x = 13 and y = 21. What is x + y?

34

p = 14 and q = 71. What is p - q?

-57

What is the vector?

(-15, 10)

What is the magnitude of the given vector?

18

What is the sum of the given two vectors?

(-5, 0)

Which of the followings is vector? Select all apply.

time

speed

acceleration

velocity

kinetic energy

potential energy

force

work

What is the charge on an electron?

-1.60 ⅹ 10⁻¹⁹ C

Two equal mass balls hang on strings as shown. What can we conclude about the signs of the charges q1 and q2? Select all apply.

A. one object is positively charged, and the other object is neutral

B. one object is negatively charged, and the other object is neutral

C. both objects are positively charged

D. one object is positively charged, and the other object is negatively charged

E. both objects are negatively charged

F. both objects are electrically neutral

Two equal mass balls hang on strings as shown. What can we conclude about the signs of the charges q1 and q2? Select all apply.

A. one object is positively charged, and the other object is neutral

B. one object is negatively charged, and the other object is neutral

C. both objects are positively charged

D. one object is positively charged, and the other object is negatively charged

E. both objects are negatively charged

F. both objects are electrically neutral

Two equal mass balls hang on strings as shown. What can we conclude about the signs of the charges q1 and q2? Select all apply.

A. one object is positively charged, and the other object is neutral

B. one object is negatively charged, and the other object is neutral

C. both objects are positively charged

D. one object is positively charged, and the other object is negatively charged

E. both objects are negatively charged

F. both objects are electrically neutral

A glass rod that has been charged to +40 nC touches a neutral metal sphere. Afterward, the rod’s charge is +10 nC. What is the charge on the metal sphere, in nC?

30

A plastic rod that has been charged to -30 nC touches a neutral metal sphere. Afterward, the rod’s charge is -20 nC. What is the charge on the metal sphere, in nC?

-10

A negatively charged electroscope has separated leaves as shown. Suppose you bring a negatively charged rod close to the top of the electroscope, but not touching. How will the leaves respond?

A. The leaves spread further apart.

B. The leaves move closer together.

C. The leaves do not change their position.

A negatively charged electroscope has separated leaves as shown. Suppose you bring a positively charged rod close to the top of the electroscope, but not touching. How will the leaves respond?

A. The leaves spread further apart.

B. The leaves move closer together.

C. The leaves do not change their position.

A rod is brought near an uncharged insulator. In response to the nearby rod, the charges in the individual molecules of the insulator realign as shown in the diagram. The rod must be  _______.

A. neutral

B. negatively charged

C. positively charged

A rod is brought near an uncharged insulator. In response to the nearby rod, the charges in the individual molecules of the insulator realign as shown in the diagram. What is the interaction between the rod and the insulator?

A. attraction

B. repulsion

C. no interaction

1. What is the direction of the electric force on q_A by q_B?

2. What is the direction of the electric force on q_B by q_A?

1. down

2. up

Point charge q₁ = 2.0 μC is located at (2.0 cm, 0) and charge q₂ = -3.2 μC is located at (-1.0 cm, 0). What is the magnitude of the electric force on q₁, in Newtons?

64

Point charge q₁ = 2.0 μC is located at (2.0 cm, 0) and charge q₂ = -3.2 μC is located at (-1.0 cm, 0). What is the magnitude of the electric force on q₂, in Newtons?

64

Two point charges are shown below. q₁ = 2.0 nC and q₂ = 4.0 nC. The distance between the two charges is 2.0 cm. Match the answers with questions.

1. What is the direction of the electric force on q₂ by q₁?

2. What is the direction of the electric force on q₁ by q₂?

1. to the right

2. to the left

Two point-charges exert 22 N electric force on each other. What will the force become in Newtons, if the distance between the two charges is doubled? 

5.5

Two point-charges exert 22 N electric force on each other. What will the force become in Newtons, if the distance between the two charges is halved? 

88

Three point charges are shown below. q₁ = 2.0 nC, q₂ = 4.0 nC, and q₃ = -1.0 nC. d₁ = 2.0 cm and d₂ = 1.0 cm. What is the direction of the net electric force on q₁?

to the left

Three point charges are shown below. q₁ = 2.0 nC, q₂ = 4.0 nC, and q₃ = -1.0 nC. d₁ = 2.0 cm and d₂ = 1.0 cm. What is the direction of the net electric force on q₂?

to the right

Three point charges are shown below. q₁ = 2.0 nC, q₂ = 4.0 nC, and q₃ = -1.0 nC. d₁ = 2.0 cm and d₂ = 1.0 cm. What is the direction of the net electric force on q₃?

to the left

Three point charges are shown below. q₁ = 2.0 μC, q₂ = 4.0 μC, and q₃ = - 1.0 μC. d₁ = 2.0 cm and d₂ = 1.0 cm. What is the magnitude of the net electric force on q₁ in Newtons? Use K = 9.0 × 10⁹ N·m²/C². 

160

Three point charges are shown below. q₁ = 2.0 μC, q₂ = 4.0 μC, and q₃ = - 1.0 μC. d₁ = 2.0 cm and d₂ = 1.0 cm. What is the magnitude of the net electric force on q₂ in Newtons? Use K = 9.0 × 10⁹ N·m²/C². 

540

Three point charges are shown below. q₁ = 2.0 μC, q₂ = 4.0 μC, and q₃ = - 1.0 μC. d₁ = 2.0 cm and d₂ = 1.0 cm. What is the magnitude of the net electric force on q₃ in Newtons? Use K = 9.0 × 10⁹ N·m²/C². 

380

Four charged particles are at the corners of a square as shown below. What is the direction of the net force on charge q, in the middle of the square? q_a = +2.0 nC, q_b = +2.0 nC, q_c = -2.0 nC, q_d = -2.0 nC, and q = -5.0 nC.

up

Four charged particles are at the corners of a square as shown below. What is the direction of the net force on charge q, in the middle of the square? q_a = -2.0 nC, q_b = -2.0 nC, q_c = -2.0 nC, q_d = -2.0 nC, and q = 5.0 nC.

0