Regents Review for E-Statics, Circuits, & Magnetism

[Pages:27]Regents Review for E-Statics, Circuits, & Magnetism

1. In the diagram below, a cloth is brought near, but does not touch a neutral electroscope. The electroscope leaves separate. What charge, if any, does the cloth have?

3. Which diagram shows the leaves of the electroscope that has already been charged positively by induction?

A)

B) A) a positive charge B) a negative charge C) an unknown charge D) no charge

2. As shown in the diagram below, a charged rod is held near, but not touching, a neutral electroscope.

C)

The charge on the knob is

A) positive and the leaves are positive

B) positive and the leaves are negative

C) negative and the leaves are positive

D)

D) negative and the leaves are negative

4. Two objects, A and B are rubbed together. If object A acquires an excess of 100 electrons object B must have

A) gained 100 electrons B) gained 100 protons C) lost 100 electrons D) lost 100 protons

5. Two metal spheres having charges of +4.0 ? 10?6 coulomb and +2.0 ? 10?5 coulomb, respectively, are brought into contact and then separated. After separation, the charge on each sphere is

A) 8.0 ? 10?11 C C) 2.1 ? 10?6 C

B) 8.0 ? 10?6 C D) 1.2 ? 10?5 C

6. When a plastic rod is rubbed with wool, the wool acquires a positive charge because

A) electrons are transferred from the wool to the rod

B) protons are transferred from the wool to the rod C) electrons are transferred from the rod to the wool D) protons are transferred from the rod to the wool

7. Base your answer to the following question on the diagram below which represents a system consisting of two charged metal spheres with equal radii.

Compared to the force exerted on sphere B at a separation of 12 meters, the force exerted on sphere B at a separation of 6.0 meters would be

A) 1/2 as great C) 1/4 as great

B) 2 times as great D) 4 times as great

8. After a neutral object loses 2 electrons, it will have a net charge of

A) ?2 elementary charges

B) +2 elementary charges

C)

elementary charge

D)

elementary charge

Base your answers to questions 9 and 10 on the diagram below and on your knowledge of physics. The diagram represents two small, charged, identical metal spheres, A and B that are separated by a distance of 2.0 meters.

9. If the two spheres were touched together and then separated, the charge on sphere A would be

A)

B)

C)

D)

10. What is the magnitude of the electrostatic force exerted by sphere A on sphere B?

A)

B)

C)

D)

Base your answers to questions 11 through 15 on the diagram below which shows two identical metal spheres. Sphere A has a charge of +12 coulombs and sphere B is a neutral sphere.

11. When spheres A and B come into contact, sphere B will

A) gain 6 coulombs of protons C) gain 6 coulombs of electrons

B) lose 6 coulombs of protons D) lose 6 coulombs of electrons

12. When spheres A and B are separated, the charge on A will be

A) +12 coulombs C) 1/2 the original amount

B) 1/4 the original amount D) 4 times the original amount

13. When spheres A and B are in contact, the total charge of the system is

A) neutral

B) +6 C

C) +12 C

D) +24 C

14. After spheres A and B are separated, which graph best represents the relationship of the force between the spheres and their separation?

A)

B)

C)

D)

15. After contact, the spheres are moved apart. As the distance between the spheres is increased, the electric potential energy of the system

A) decreases C) remains the same

B) increases

16. Which fundamental force is primarily responsible for the attraction between protons and electrons?

A) strong C) gravitational

B) weak D) electromagnetic

17. Oil droplets may gain electrical charges as they are projected through a nozzle. Which quantity of charge is not possible on an oil droplet?

A) 8.0 ? 10?19 C C) 3.2 ? 10?19 C

B) 4.8 ? 10?19 C D) 2.6 ? 10?19 C

18. What is the smallest electric charge that can be put on an object?

A) 9.11 ? 10?31 C C) 9.00 ? 109 C

B) 1.60 ? 10?19 C D) 6.25 ? 1018 C

19. In the diagram below a negatively charged rod approaches a neutral pith ball. In which direction will the pith ball first move?

A) A B) B C) C D) D E) it won't move because it is neutral

20. The diagram below represents two electrically charged identical-sized metal spheres, A and B.

Base your answers to questions 22 and 23 on the information and diagram below.

If the spheres are brought into contact, which sphere will have a net gain of electrons?

A) A, only C) both A and B

B) B, only D) neither A nor B

21. If the charge on each of two small charged metal spheres is doubled and the distance between the spheres remains fixed, the magnitude of the electric force between the spheres will be

A) the same B) two times as great C) one-half as great D) four times as great

Two small metallic spheres, A and B, are separated by a distance of 4.0 ? 10?1 meter, as shown. The charge on each sphere is +1.0 ? 10?6 coulomb. Point P is located near the spheres.

22. Which arrow best represents the direction of the resultant electric field at point P due to the charges on spheres A and B?

A)

B)

C)

D)

23. What is the magnitude of the electrostatic force between the two charged spheres?

A) 2.2 ? 10?2 N C) 2.2 ? 104 N

B) 5.6 ? 10?2 N D) 5.6 ? 104 N

24. The diagram below shows the arrangement of three charged hollow metal spheres, A, B, and C. The arrows indicate the direction of the electric forces acting between the spheres. At least two of the spheres are positively charged.

Which sphere, if any, could be negatively charged?

A) sphere A C) sphere C

B) sphere B D) no sphere

25. Which diagram best represents the electric field around a negatively charged conducting sphere?

A)

B)

C)

D)

26. Which diagram represents the electric field between two oppositely charged conducting spheres?

A)

B)

C)

D)

27. Two positively charged masses are separated by a distance, r. Which statement best describes the gravitational and electrostatic forces between the two masses?

A) Both forces are attractive. B) Both forces are repulsive. C) The gravitational force is repulsive and the

electrostatic force is attractive. D) The gravitational force is attractive and the

electrostatic force is repulsive.

28. The diagram below represents the electric field surrounding two charged spheres. A and B.

29. In the diagram below, two positively charged spheres, A and B, of masses mA and mB are located a distance d apart.

Which diagram best represents the directions of the gravitational force, Fg, and the electrostatic force, Fe , acting on sphere A due to the mass and charge of sphere B? [Vectors are not drawn to scale.] A)

B)

What is the sign of the charge of each sphere?

A) Sphere A is positive and sphere B is negative. B) Sphere A is negative and sphere B is

positive. C) Both spheres are positive. D) Both spheres are negative

C)

D)

30. An electron is placed between two oppositely charged parallel plates as shown in the diagram below.

As the electron moves toward the positive plate, the magnitude of the electric force acting on the electron

A) decreases

B) increases

C) remains the same

31. Base your answer to the following question on the diagram below which represents two large parallel conducting plates charged to a potential of 10. volts. The plates are separated by a distance of 0.050 meter.

Compared to the magnitude of the electric force on the electron at point P , the magnitude of the electric force on the electron at point A is

A) less and directed upwards C) the same and directed upwards E) greater and directed downwards

B) greater and directed upwards D) the same and directed downwards F) less and directed downwards

32. An electron placed between oppositely charged parallel plates A and B moves toward plate A, as represented in the diagram below

34. If only the original source voltage is increased, the electric field intensity between the plates will

A) decrease

B) increase

C) remain the same

What is the direction of the electric field between the plates?

A) toward plate A C) into the page

B) toward plate B D) out of the page

Base your answers to questions 33 and 34 on the diagram below which shows two parallel metal plates A and B connected to a voltage source.

33. If only the distance between the plates is increased, the electric field intensity between the plates will

A) decrease

B) increase

C) remain the same

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