Question 1

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

Accepted Answer

Charge is transferred from one object to another, but the total charge remains constant.

Question 2

A glass rod is rubbed with silk and becomes positively charged. What happens at the atomic level?

Accepted Answer

The glass rod loses electrons to the silk.

Question 3

Two identical metal spheres, one with +5 units of charge and the other with -1 unit, are brought into contact and then separated. What is the final charge on each sphere?

Accepted Answer

Each sphere has +2 units of charge.

Question 4

Which material is most likely to allow charge to move freely through it?

Accepted Answer

Metal

Question 5

What is the SI unit for electric charge?

Accepted Answer

Coulomb

Question 6

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

Accepted Answer

The force increases by a factor of four.

Question 7

Which equation correctly represents Coulomb’s law for the magnitude of the force between two point charges?

Accepted Answer

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

Question 8

A neutral conducting sphere is brought near a positively charged rod but not touched. What happens to the charges in the sphere?

Accepted Answer

Negative charges in the sphere move toward the rod, positive charges move away.

Question 9

Which of the following is true about the electric field inside a conductor in electrostatic equilibrium?

Accepted Answer

The electric field is zero everywhere inside the conductor.

Question 10

If a charged object is brought near a neutral object, what type of force is observed between them?

Accepted Answer

Always attractive

Question 11

A parallel-plate capacitor creates a uniform electric field. Which equation gives the field strength between the plates?

Accepted Answer

$$E = \frac{Q}{\$$epsilon_0$$ A}$$

Question 12

What is the direction of the electric field lines around a positive point charge?

Accepted Answer

Away from the charge

Question 13

A small glass bead (mass $$15 	imes 10$$^{-6}$$ kg, charge +10$ nC) is placed 1 cm below a plastic sphere charged to -10$ nC. What is the electric force between them? (Use K = 9$$ 	imes $$10^9 N$$·m$$^2/C$^2)$$

Accepted Answer

$$F = 9 	imes 10$$^{-5}$$ N$

Question 14

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

Accepted Answer

Charge is redistributed in a neutral object due to a nearby charged object, without direct contact.

Question 15

What is the magnitude of the charge of a proton?

Accepted Answer

$$1.60 	imes 10$$^{-19}$$ C

Question 16

If the electric field at a point is $$E$$ and a charge $$q is $$placed at that point, what is the force experienced by the charge?

Accepted Answer

$$F = qE$$

Question 17

Which of the following is NOT a consequence of Coulomb’s law?

Accepted Answer

The force between two charges is always attractive.

Question 18

A dipole consists of two equal and opposite charges separated by a distance $$s. $$What is the dipole moment?

Accepted Answer

$$p = qs$$

Question 19

Which of the following statements about electric field lines is correct?

Accepted Answer

Field lines start on positive charges and end on negative charges.

Question 20

In a parallel-plate capacitor, what change would increase the electric field strength between the plates?

Accepted Answer

Increase the magnitude of the charge on both plates.

Electric Fields and Electric Forces: Fundamental Concepts and Applications

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