Review Questions

1. When charge is transferred from one object to another, which of the following are actually transferred?

   1. electrons
   2. protons
   3. neutrons
   4. quarks
   5. photons

2. Two conducting spheres of equal size have a charge of −3 C and +1 C, respectively. A conducting wire is connected from the first sphere to the second. What is the new charge on each sphere?

   1. −4 C
   2. +4 C
   3. −1 C
   4. +1 C
   5. zero

3. If the electric force between two charges is attractive, which of the following must be true?

   1. One charge is positive and the other charge is negative.
   2. Both charges are positive.
   3. Both charges are negative.
   4. The two charges must be equal in magnitude.
   5. The force must be directed toward the larger charge.

4. Two charges q₁ and q₂ are separated by a distance r and apply a force F to each other. If both charges are doubled, and the distance between them is halved, the new force between them is

   1. 
   2. 
   3. 4F.
   4. 8F.
   5. 16F.

5. Two uncharged spheres A and B are near each other. A negatively charged rod is brought near one of the spheres.

   

   The far right side of sphere B is

   1. uncharged.
   2. neutral.
   3. positive.
   4. negative.
   5. equally positive and negative.

6. Two charges A and B are near each other, producing the electric field lines shown.

   

   What are the two charges A and B, respectively?

   1. positive, positive
   2. negative, negative
   3. positive, negative
   4. negative, positive
   5. neutral, neutral

7. A force of 40 N acts on a charge of 0.25 C in a region of space. The electric field at the point of the charge is

   1. 10 N/C.
   2. 100 N/C.
   3. 160 N/C.
   4. 40 N/C.
   5. 0.00625 N/C.

8. Electric potential

   1. is a vector quantity.
   2. is proportional to the work done in an electric field.
   3. is always equal to the electric field.
   4. is zero when a charge is in an electric field.
   5. is measured in N/C.

9. Two conducting plates are separated by a distance of 0.001 m. A 9 V battery is connected across the plates. The electric field between the plates is

   1. 9,000 V/m.
   2. 900 V/m.
   3. 9 V/m.
   4. 0.009 V/m.
   5. 0.00011 V/m.

10. Questions 10–11 refer to the following.

11. Two charged parallel plates are oriented as shown.

    

    The following particles are placed between the plates, one at a time:

    1. electron
    2. proton
    3. neutron

12. 10. Which of the particles would move to the right between the plates?

        1. I and II only
        2. I and III only
        3. II and III only
        4. II only
        5. I only

    11. Which of the particles would not experience a force while between the plates?

        1. I and II only
        2. II and III only
        3. I only
        4. III only
        5. I, II, and III