Unit 6 Quiz 3 Practice Questions

Base your answers to questions 1 and 2 on the diagram below which shows two oppositely charged parallel plates.

U6Q3Image1.gif (2372 bytes)

1. If an electron moves from point A to point B, the electron's electric potential energy will
decrease increase remain the same

2. If an electron moves from point A to point C, the electron's electric potential energy will
decrease increase remain the same

3. The diagram below represents a positive test charge located near a positively charged sphere.

U6Q3Image2.gif (2987 bytes)


The greatest increase in the electric potential energy of the test charge would be caused by moving the charge to
point A point B point C point D

4. The diagram below represents a system consisting of two charged metal spheres with equal radii.

U6Q3Image3.gif (4025 bytes)

Compared to the electrical PE of the system at a separation of 12 m, the electrical PE at a separation of 6 m is
less greater the same

5. A volt is defined as a
J/C J/s C/s J.s/C

6. A proton moves through a potential difference of 1000 V. The change in the proton's potential energy will be
1000 eV 2000 eV 3000 eV 4000 eV

7. How much energy is required to move 3.2 x 10-19 C of charge through a potential difference of 5 volts ?
5 eV 2 eV 10 eV 20eV

8. An oil drop has a charge of -4.8 x 10-19 C. How many excess electrons does the oil drop have ?
1.6 x 10-19 2.0 3.0 6.3 x 1018

9. How much energy is needed to move one electron through a potential difference of 100 volts ?
1.0 J 100 J 1.6 x 10-19 J 1.6 x 10-17 J

10. Moving a point charge of 3.2 x 10-19 C between points A and B in an electric field requires 4.8 x 10-19 J of
energy. What is the potential difference between these two points ?
0.67 V 2.0 V 3.0 V 1.5 V

11. The work required to move a charge of 0.04 C from one point to another in an electric field is 200 J.
What is the potential difference between these two points ?
5000 V 2 x 10-4 V 8 V 200 V

12. The potential difference between two large parallel metal plates is 100 V, and the distance between the plates
4.0 x 10-3 m. What is the magnitude of the electric field intensity ?
2.5 x 104 N/C 7.5 x 104 N/C 2.5 x 103 N/C 4.0 x 10-5 N/C

13. The energy of an electron may be increased by 8 x 10-17 J if it is moved through a potential difference of
0.002 V 200 V 500 V 5000 V