Question 1

Which of the following best describes the fundamental property of electric charge?

Accepted Answer

Electric charge is a fundamental property of all objects, similar to mass.

Question 2

What is the correct unit for electric charge?

Accepted Answer

Coulomb (C)

Question 3

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

Accepted Answer

The force is reduced to one-fourth.

Question 4

Which equation correctly represents Coulomb’s Law for the force between two charges $$q_1$$ and $$q_2$$ separated by a distance $$r$$?

Accepted Answer

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

Question 5

A neutral lithium atom has 3 protons, 4 neutrons, and 3 electrons. If it loses one electron, what is its net charge?

Accepted Answer

Positive net charge

Question 6

Which material is most likely to allow electrons to move freely, making it a good conductor?

Accepted Answer

Copper

Question 7

When a negatively charged object is brought near a neutral metal ball, what happens to the electrons in the metal ball?

Accepted Answer

Electrons are forced away from the charged object.

Question 8

If two spheres, one negatively charged and one neutral, are brought close together but do not touch, what is the expected interaction?

Accepted Answer

They will attract each other.

Question 9

After two metal spheres, one negatively charged and one neutral, touch each other, what is the expected outcome?

Accepted Answer

Both spheres will have a net negative charge and repel each other.

Question 10

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

Accepted Answer

Conductors allow electrons to move freely, while insulators do not.

Question 11

A student rubs a balloon on their hair and then brings it near a wall. The balloon sticks to the wall. Which principle explains this phenomenon?

Accepted Answer

Induction of charge

Question 12

Which of the following is NOT a fundamental force in nature?

Accepted Answer

Frictional force

Question 13

If the electric force between two charges is $$F$$ when they are separated by $$r$$, what will the force be if the distance is reduced to $$\frac{r}{2}$$?

Accepted Answer

$$4F$$

Question 14

Which of the following best describes the conservation of charge?

Accepted Answer

The total charge in a closed system remains constant.

Question 15

A student observes that when a charged rod touches a metal sphere, the charge spreads evenly across the sphere. This is because:

Accepted Answer

The sphere is a conductor and electrons move freely.

Question 16

Which scenario best illustrates the application of Coulomb’s Law in a real-world context?

Accepted Answer

Determining the force between two charged balloons.

Question 17

If a material is described as having a 'sea of electrons,' what property does it exhibit?

Accepted Answer

It is a conductor.

Question 18

Which of the following best explains why electrons are more easily removed from atoms than protons?

Accepted Answer

Electrons are loosely bound compared to protons.

Question 19

A student wants to charge a metal ball by induction. Which step is necessary for this process?

Accepted Answer

Bringing a charged object near the ball and then grounding the ball.

Question 20

Which of the following is true about the direction of the electric force between two charges?

Accepted Answer

The force is always along the line joining the charges.

Introduction to Electrostatics: Charge, Materials, and Coulomb’s Law

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