Question 1

Which of the following statements best describes the law of conservation of charge?

Accepted Answer

Charge can be transferred between objects, but the total charge remains constant.

Question 2

A plastic rod is rubbed with wool and then brought near small pieces of paper. The paper is attracted to the rod. What is the best explanation for this observation?

Accepted Answer

The plastic rod has gained a negative charge and induces a separation of charge in the paper, causing attraction.

Question 3

Which of the following is NOT a property of conductors?

Accepted Answer

They have tightly bound electrons that cannot move freely.

Question 4

If a glass rod is rubbed with silk, which of the following statements is correct according to Benjamin Franklin's convention?

Accepted Answer

The glass rod becomes positively charged.

Question 5

Two identical metal spheres, A and B, are touching. A is neutral and B is negatively charged. What happens if the spheres are separated after contact?

Accepted Answer

Both spheres become negatively charged, sharing the excess electrons.

Question 6

Which of the following best explains why insulators cannot be charged by rubbing in the same way as conductors?

Accepted Answer

Insulators have tightly bound electrons that do not move freely.

Question 7

A student rubs a plastic rod with wool and brings it near a metal sphere suspended by a thread. The sphere is initially neutral. What happens to the sphere?

Accepted Answer

The sphere is attracted to the rod due to induced charge separation.

Question 8

Which of the following statements about electric charge is correct?

Accepted Answer

Electrons and protons are the basic charges of ordinary matter.

Question 9

According to Coulomb's law, the electric force between two point charges is:

Accepted Answer

Inversely proportional to the square of the distance between the charges.

Question 10

A charged glass rod is brought near a suspended charged plastic rod. The plastic rod is repelled. What can you conclude about the charge on the plastic rod?

Accepted Answer

It must have the same type of charge as the glass rod.

Question 11

Which of the following is a correct statement about the behavior of charges?

Accepted Answer

Like charges repel and unlike charges attract.

Question 12

A metal sphere is charged by contact with a charged plastic rod. Which of the following best describes the process?

Accepted Answer

Electrons are transferred from the rod to the sphere, giving the sphere a net charge.

Question 13

Which of the following is true about the electric field created by a point charge?

Accepted Answer

The electric field exerts a force on other charges in its vicinity.

Question 14

A student observes that a charged object attracts both a small piece of paper and a neutral metal rod. What is the best explanation for this observation?

Accepted Answer

The charged object induces a separation of charge in both the paper and the metal rod, resulting in attraction.

Question 15

Which of the following best describes the difference between conductors and insulators?

Accepted Answer

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

Question 16

A neutral object is brought near a negatively charged rod. What happens to the charges in the neutral object?

Accepted Answer

Electrons in the neutral object are repelled, causing a separation of charge.

Question 17

Which of the following is a real-world example of charge transfer by friction?

Accepted Answer

Walking across a carpet and then receiving a shock when touching a metal doorknob.

Question 18

If the force between two charges is $$F$$ when they are separated by a distance $$r$$, what will the force be if the distance is doubled, according to Coulomb's law?

Accepted Answer

$$\frac{F}{4}$$

Question 19

Which of the following best describes the process of charging by induction?

Accepted Answer

Separating charges within an object by bringing a charged object near it, without contact.

Fundamentals of Electric Charge and Electrostatics

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