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ให้นักเรียนลองแปลและหาคำตอบตามความเข้าใจของตน  ใครทำข้อไหนได้ก็ตอบเลยครับ (ในช่องแสดงความคิดเห็น)

1. The electrical force between charges is strongest when the charges are
A) The electric force is constant everywhere.
B) far apart.
C) close together.

a. C) close together.
b. B) fall closer together.
c. C) loosely bound.
d. A) none of these

2. The energy acquired by a particle carrying a charge equal to that on the electron as a result of moving through a potential difference of one volt is referred to as
A) a joule.
B) an electron-volt.
C) a proton-volt.
D) a coulomb.

a. B) an electron-volt.
b. A) negative.
c. C) electrical
d. D) a negative ion.

3. The unit of electric charge, the coulomb, is the charge on
A) a specific number of neutrons.
B) a specific large number of electrons.
C) one electron.
D) a quark.
E) a neutron.

a. B) an electron-volt.
b. B) a specific large number of electrons.
c. E) protons than electrons.
d. B) the electrical repulsion.

4. A balloon will stick to a wooden wall if the balloon is charged
A) None of the above choices are correct.
B) negatively.
C) either positively or negatively.
D) positively.

a. B) Positively charged
b. C) either positively or negatively.
c. A) positive ion.
d. C) positively charged.

5. Which of the following is not a vector?
A) electric line of force
B) electric field
C) electric force
D) electric potential

a. D) zero for both.
b. B) an electron-volt.
c. A) electric charge
d. D) electric potential

6. Two charges are separated by a distance d and exert mutual attractive forces of F on each other. If the charges are separated by a distance of d/3, what are the new mutual forces?
A) 9F
B) F/9
C) 3F
D) F/3

a. D) 50 V
b. D) 2v
c. B)
d. A) 9F

7. What are the units of the Coulomb constant k, which appears in Coulomb’s law?
A) Nm^2/C^2
B) Nm/C
C) N/C
D) N^2m/C^2

a. A) A
b. D) 2v
c. A) Nm^2/C^2
d. A) – – +

8. Which of the following is not a vector?
A) electric charge
B) electric field
C) electric force
D) electric line of force

a. C) electrical
b. B) Positively charged
c. A) electric charge
d. E) charge.

9. An uncharged pith ball is suspended by a nylon fiber. When a negatively charged rubber rod is brought nearby, without touching it, the pith ball
A) None of the above choices are correct.
B) in unaffected.
C) is repelled by the rod.
D) becomes charged by induction.
E) becomes polarized.

a. C) close together.
b. E) the same.
c. E) charge.
d. E) becomes polarized.

10. A small charged ball is accelerated from rest to a speed v by a 500 V potential difference. If the potential difference is changed to 2000 V, what will the new speed of the ball be?
A) 16v
B) 4v
C) v
D) 2v

a. A) 9F
b. A) A
c. D) 50 V
d. D) 2v

11. Electric field lines near positive point charges
A) radiate outward.
B) circle clockwise.
C) circle counter-clockwise.
D) radiate inward.

a. A) conductors.
b. E) repel or attract.
c. C) close together.
d. A) radiate outward.

12. Materials in which the electrons are bound very loosely to the nuclei and can move about freely within the material are referred to as
A) conductors.
B) semiconductors.
C) superconductors.
D) insulators.

a. A) energy.
b. C) a proton.
c. D) by induction
d. A) conductors.

13. A solid block of metal in electrostatic equilibrium is placed in a uniform electric field. Give a statement concerning the electric field in the block’s interior.
A) The interior field points in a direction opposite to the exterior field.
B) There is no electric field in the block’s interior.
C) The interior points in a direction that is parallel to the exterior field.
D) The interior field points in a direction that is at right angles to the exterior field.

a. B) electric field and gravitational field.
b. B) become uniformly distributed on the sphere’s outer surface.
c. B) There is no electric field in the block’s interior.
d. A) The top surface is charged positively.

14. Sphere A carries a net positive charge, and sphere B is neutral. They are placed near each other on an insulated table. Sphere B is briefly touched with a wire that is grounded. Which statement is correct?
A) Sphere B is now negatively charged,
B) Sphere B is now positively charged.
C) The charge on sphere B cannot be determined without additional information.
D) Sphere B remains neutral.

a. D) conservation of charges
b. A) Sphere B is now negatively charged,
c. C) positively charged.
d. A) electric charge

15. The model of the atom shows a
A) nucleus consisting of both protons and electrons, surrounded by a cloud of neutrons
B) nucleus consisting of both protons and neutrons, surrounded by a cloud of electrons.
C) nucleus consisting of both electrons and neutrons, surrounded by a cloud of protons.
D) neutrally charged nucleus surrounded by both protons and electrons.

a. A) electrons that surround the nucleus.
b. C) is a whole-number multiple of the charge of one electron.
c. B) nucleus consisting of both protons and neutrons, surrounded by a cloud of electrons.
d. B) a specific large number of electrons.

16. Two charges separated by one meter exert 1-N forces on each other. If the charges are pushed to 1/4 meter separation, the force on each charge will be
A) 8 N.
B) 4 N.
C) 16 N.
D) 1 N.
E) 2 N.

a. C) 16 N.
b. A) A
c. A) – – +
d. B) volt.

17. s it possible to have a zero electric field value between two positive charges along the line joining the two charges?
A) cannot be determined without knowing the separation between the two charges
B) No, a zero electric field cannot exist between the two charges.
C) Yes, regardless of the magnitude of the two charges.
D) Yes, if the two charges are equal in magnitude.

a. E) None of the above choices are correct.
b. A) Sphere B is now negatively charged,
c. A) No, a zero electric field cannot exist between the two charges.
d. C) Yes, regardless of the magnitude of the two charges.

18. A negatively charged balloon sticks to a wooden door. However, an uncharged balloon does not stick to a wooden door. What is the nature of the charge on the wooden door?
A) Lacking protons
B) Positively charged
C) Conductor
D) Electrically neutral

a. C) positively charged.
b. B) Positively charged
c. A) electric charge
d. A) positive ion.

19. A conductor differs from an insulator in that a conductor
A) none of these
B) has more energy than an insulator.
C) has more electrons than protons.
D) has faster moving molecules.
E) has more protons than electrons.

a. A) – – +
b. A) none of these
c. C) Wet skin
d. C) close together.

20. An atom has more electrons than protons. The atom is
A) a superconductor.
B) impossible.
C) a positive ion.
D) a negative ion.

a. C) a proton.
b. D) by induction
c. D) a negative ion.
d. A) positive ion.

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