Question 1

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

Accepted Answer

Friction

Question 2

A student measures the wind velocity at a location. Which type of physical quantity is wind velocity?

Accepted Answer

Vector

Question 3

Which statement best describes the difference between conductors and insulators?

Accepted Answer

Conductors allow electric charge to flow freely, while insulators restrict the flow of charge.

Question 4

According to Coulomb’s Law, what happens to the force between two point charges if the distance between them is doubled?

Accepted Answer

The force is reduced to one-fourth.

Question 5

Which equation correctly represents Coulomb’s Law for the force between two point charges?

Accepted Answer

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

Question 6

A hydrogen atom consists of a proton and an electron separated by $$r = 5.3 	imes 10$$^{-11}$$ m. What is the magnitude of the electrostatic force between them? (Use k = 8.99$$ 	imes $$10^9 N$$·m$$^2/C$^2$$, $$e = 1.6 	imes 10$$^{-19}$$ C)

Accepted Answer

$$F = 2.3 	imes 10$$^{-8}$$ N

Question 7

Which of the following is a scalar quantity?

Accepted Answer

Temperature

Question 8

If two positive charges are placed near each other, what will happen?

Accepted Answer

They will repel each other.

Question 9

A 2 μC charge and a 7 μC charge are separated by 0.2 m. What is the magnitude of the force between them? (Use $$k = 8.99 	imes 10^9$ N·m^2$/C^2$)

Accepted Answer

3.15 N

Question 10

Which principle states that the total force on a charge is the vector sum of all individual forces acting on it?

Accepted Answer

Principle of Superposition

Question 11

What is the net force exerted on a 0.02-C charge by two other charges (+0.10 C at 2 m and +0.04 C at 1 m)? (Use $$k = 8.99 	imes 10^9$ N·m^2$/C^2$)

Accepted Answer

$$2.7 	imes 10^6$ N

Question 12

Which of the following is true about the conservation of electric charge?

Accepted Answer

The net charge of a closed system never changes.

Question 13

A positive and negative charge of equal magnitude are connected by a rigid rod and placed near a large negative charge. What is the direction of the net force on the rod?

Accepted Answer

To the left

Question 14

Which of the following is the correct vector addition technique?

Accepted Answer

Tail-to-head method for each vector.

Question 15

If $$\vec{A}$$ and $$\vec{B}$$ are vectors, which equation represents vector subtraction?

Accepted Answer

$$\vec{A} - \vec{B} = \vec{A} + (-\vec{B})$$

Question 16

Which of the following is a correct problem-solving strategy for force diagrams?

Accepted Answer

Draw a clear force diagram and use consistent units.

Question 17

In a triangle arrangement, a +2 μC charge is placed at the vertex, with a +7 μC charge 6 m away and a -3.5 μC charge 4 m away. What is the total force on the +2 μC charge? (Use $$k = 9 	imes 10^9$ N·m^2$/C^2$)

Accepted Answer

$$4.9 	imes 10$$^{-3}$$ N

Question 18

Which force is much stronger in a hydrogen atom: the electrostatic force or the gravitational force?

Accepted Answer

Electrostatic force

Question 19

Which of the following best describes the net charge of an electrically neutral object?

Accepted Answer

The object contains equal amounts of positive and negative charges.

Electric Charge, Coulomb’s Law, and Vector Quantities: Study Notes for College Physics

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