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Unit 8 Quiz#2

Equations:

Part 1: Problem-Solving

For the following problems, show your work to receive full and partial credit.

1. A positive charge of 7.0 x 10-3 C experiences a 5.6 x 10-2 N force when placed in an electric field. Calculate the magnitude of the electric field.

 

2. A charge of 6.00 x 10-8 C is placed in an electric field of intensity 6.00 x 104 N/C. What is the magnitude of the electric force on the charge?

 

3. Two parallel plates, with opposite charges are 10.0 cm apart. A test charge placed midway between the plates experiences a 0.50 N force. The magnitude of the electric field midway between the plates is 2.0 x 103 N/C. Calculate the magnitude of the test charge.

 

4. A voltmeter shows a 56.0 V potential difference between two metal parallel plates. The field intensity between the plates is 750 N/C. Calculate the distance between the plates.

 

5. An oil drop having a charge of 8.0 x 10-19 C is suspended between two charged parallel plates. The plates are separated by a distance of 8.0 mm, and there is a potential difference of 1200 V between the plates. What is the weight of the suspended oil drop?

 

Part 2: Multiple Choice

For the following questions, choose the one best answer. To score 6 points., answer seven of the eleven questions correctly.

1. The electric field around an isolated electron has a certain strength 1 cm from the electron. The electric field strength 2 cm from the electron is _________.

  1. half as much
  2. the same
  3. twice as much
  4. four times as much
  5. none of these

2. If you use 10 J of work to push a unit charge into an electric field, its voltage with respect to its starting position is _________.

  1. less than 10 V
  2. 10 V
  3. more then 10 V

 

3. If you use 10 J of work to push a charge into an electric field and then release the charge, as it flies past its starting position, its kinetic energy is __________.

  1. less than 10 J
  2. 10 J
  3. more than 10 J

 

4. Two charges separated by one meter exert a one N force on each other. If the magnitude of each charge is doubled, the force on each charge is _________.

  1. 1 N
  2. 2 N
  3. 8 N
  4. 4 N
  5. none of these

 

5. The electrical force on a 2 C charge is 60 N. What is the value of the electric field at the place where the charge is located?

  1. 20 N/C
  2. 30 N/C
  3. 60 N/C
  4. 120 N/C
  5. 240 N/C

 

6. An electron is pushed into an electric field where it acquires a 1 V electrical potential. If two electrons are pushed the same distance into the same electric field, the electrical potential of the two electrons is __________.

  1. 0.25 V
  2. 0.5 V
  3. 1 V
  4. 2 V
  5. 4 V

 

7. The electric field inside an uncharged metal ball is zero. If the ball is negatively charged, the electric field inside the ball is then ___________.

  1. less than zero
  2. zero
  3. greater than zero

 

8. Two charged particle held close to each other are released. As the particles move, the velocity of each increases. Therefore, the particles have ___________.

  1. the same sign
  2. the opposite sign
  3. not enough information given

9. An oil drop has a charge of 8.0 x 10-19 C How many excess electrons does the oil drop have?

  1. 1
  2. 3
  3. 5
  4. 7

 

10. Which diagram represents the electric field surrounding two like charges?

 

11. Which diagram shows lines of force about a positive test charge?

 

Part 3: Fill in the Blank

1. The electric _______________ concept is used to describe the behavior of one charged object when near another charged object.

 

2. Electric field ______________ are drawn to show the path that would be followed by a positive test charge placed in the field.

 

3. The direction of the force on the positive test charge near a _______________ charge is away from the charge.

 

4. The difference in potential between any two points in a field is the ________________ required to move a unit of whatever is affected by the field between the points.

 

5. The electric field between two charged parallel plates is ______________ except near the edges.

 

6. When electrons are forced away from a ______________ plate, work is done.

 

7. In electrical terminology, one joule per coulomb is one ______________.

 

8. An American physicist, ____________________, first measured the charge on an electron.

 

9. An object can only have a charge that is an integral multiple of the charge on the ________________.

 

10. If two charged spheres are touched together, electrons will move to the sphere with the _________________ potential.

 

11. ________________ occurs when an object feeds all of its excess charge to the earth and becomes electrically neutral.

 

 

 

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© Tom Henderson, 1996-1998


Glenbrook South High School.

Last updated on 9/29/98.