1. Concepts sheet Electrostatics Exam
Give examples of charging by induction, conduction, and friction.
Understand insulators vs. conductors.
How do charged objects attract neutral objects?
What is Coulomb’s Law?
Draw electric field lines for a) a single negative point charge, b) a single positive point charge, c) two identical positive charges, d) two identical negative charges, e) one positive charge and one negative charge of the same magnitude, and f) a parallel-plate capacitor
What is capacitance?
What is a dielectric? Name two advantages of using a dielectric.
Differentiate between electric potential (voltage) and electric potential energy.
How is electric potential energy analogous to gravitational potential energy and spring potential energy?
Understand the connections between at least one real-life topic and the parallel-plate capacitor model (either the plasma membrane that we went over in class or the topic you researched for your poster)

2. Equation sheet for exam

3. Electrostatics Review Jeopardy!

4. Today’s Categories… Electric Fields Electric Force
Voltage (Electric Potential) and PE
Capacitors
Methods of Charging
Random

5. Electric Fields
Electric Forces
Voltage and PE
Methods of Charging
Capacitors
Random
$100
$100
$100
$100
$100
$100
$200
$200
$200
$200
$200
$200
$300
$300
$300
$300
$300
$300
$400
$400
$400
$400
$400
$400
$500
$500
$500
$500
$500
$500

6. Electric Fields - $100
Draw the electric field on a single positive point charge and a single negative point charge.
Lines will point toward negative and away from positive
Back to Board

7. Electric fields - $200
When the positively charged puck is released, it will
Head straight for the goal
Head toward the positive “plate”
Head toward the negative ”plate” C
Back to Board

8. Electric Fields - $300
If q is negative, what is the direction of the electric field at point P?
To the left
Back to Board

9. Electric Fields - $400
Which diagram best illustrates the electric field around two unlike charges?
A B.
C D. B
Back to Board

10. Electric Fields - $500
R is a small test charge feeling the field generated by point charges P and Q. Determine
Whether P and Q are positive, negative, or neutral
Which direction R will move if it is negative
P and Q are positive, R will move toward P
Back to Board

11. Electric Force - $100
An electric force F exists between two charged spheres. If the quantity of charge on each sphere is doubled, the electric-force between the two spheres will be equal to
F/2 2F 3F 4F D
Back to Board

12. Electric Force- $200
Two charged objects are separated by a distance d. The first charge is larger in magnitude than  the second charge.      
A)  The first charge exerts a larger force on the second charge.       
B)  The second charge exerts a larger force on  the first charge.        
C)  The charges exert forces on each other that are equal in magnitude  C
Back to Board

13. Electric Force - $300
Two objects exert 90 N of electric force on each other when they are 3 m away from each other. When they are pulled 9 m away from each other, what is the new magnitude of the force on them?
10N
Back to Board

14. Electric Force- $400
Two electrons are separated by a distance of 3.00E–6 meter. What are the magnitude and direction of the electrostatic forces each exerts on the other?
A. 2.56E–17 N away from each other
B. 7.67E–23 N away from each other
C. 2.56E–17 N toward each other
D. 7.67E–23 N toward each other A
Back to Board

15. Electric Force- $500
Two balloons exert N of force on each other and repel each other a distance of 20 cm. Calculate the charge on each balloon.
1.5 x 10-7 C
Back to Board

16. Voltage and PE $100
The energy required to move one elementary charge through a potential difference of 5.0 volts is
A. 8.0 J
B. 8.0E–19 J
C. 1.6E–19 J
D. 5.0 J B
Back to Board

17. Voltage and PE $200
Moving 2.5E–6 coulombs of charge from point A to point B in an electric field requires 6.3E–4 joules of work. The potential difference (voltage) between points A and B is approximately
A. 1.6E–9 V
B. 4.0E–3 V
C. 2.5E2 V
D. 1.0E14 V C
Back to Board

18. Voltage and PE $300
Where would you move the positively charged puck to in order to decrease its potential energy? Up
Down
Right
Left
N/m

19. Voltage and PE $400
An electron placed in the center of this electric field would move
A. Right
B. Left
C. Up
D. Down
right
Back to Board

20. Voltage and PE $500
Suppose an electron in an old school TV picture tube is accelerated from rest through a potential difference ∆V = V. What is the change in potential energy of the electron?
8x 1016 J
Back to Board

21. Methods of Charging- $100
What method of charging is Reuben using to charge the babies?
friction
Back to Board

22. Methods of Charging - $200
A negatively charged plastic tube is brought close to, but does not touch, a small piece of paper. If the tube and the paper are attracted to each other, the charge on the paper
A. may be positive or neutral
B. must be negative
C. must be positive
D. may be negative or neutral A
Back to Board

23. Methods of Charging - $300
An originally neutral metal saw (conductive) is used to cut down an originally neutral tree (less conductive). Friction between them makes the tree
positively charged
Negatively charged
Remain neutral
b. Negatively charged
Back to Board

24. Methods of Charging - $400
An electrically neutral object can be attracted by a positively charged object because
A. like charges repel each other
B. the net charge in a closed system varies
C. the neutral body becomes charged by contact
D. the charges on a neutral body can be redistributed D
Back to Board

25. Methods of charging - $500
The diagram below shows two metal spheres charged to +1.0E-6 coulomb and +3.0E-6 coulomb, respectively, on insulating stands separated by a distance of 0.10 meter. The spheres are touched together and then returned to their original positions. What is the new charge on the spheres?
2 E-6
Back to Board

26. Capacitors - $100
Which of the following increases the capability of a capacitor to store charge? Choose all that apply.
Decreasing the area of the plates
Increasing voltage between plates
Moving plates closer together
Adding a dielectric
Moving plates farther apart D
Back to Board

27. Capacitors- $200
Which of the following is not an advantage of using a dielectric?
It increases the capacitance
It increases the charge stored
It decreases the voltage
It allows you to decrease the distance between the two plates without the two plates touching
All of the above are advantages C
Back to Board

28. Capacitors - $300
Which of the following increases the capability of a capacitor to store charge? Choose all that apply.
Decreasing the area of the plates
Increasing voltage between plates
Moving plates closer together
Adding a dielectric
Moving plates farther apart
D, C
Back to Board

29. Capacitors - $400
Calculate A) the capacitance of a capacitor whose plates are 20 cm × 3.0 cm and are separated by a 1.0-mm gap and B) the charge on each plate if they’re hooked up to a 12-V battery. (Be careful with conversions!)
5.3 x F, 6.4 x C
Back to Board

30. Capacitors- $500 Back to Board
You have a capacitor you need to charge, which typically uses a 12V battery to charge. If you only had a AA (1.5V) battery on hand, how would you need to change the capacitor in order to store the same amount of charge? (Hint: first figure out the factor by which the capacitance should increase or decrease)
Increase the area of the plate by a factor of 6
Decrease the distance between the plates by a factor of 8
Decrease the dielectric constant by a factor of 8 B
Back to Board

31. Random $100
An object possessing an excess of 6.0E+6 electrons has a net charge of magnitude
5.5 x C
9.6 x C
2.7 x C
3.8 x C B
Back to Board

32. Random $200
In the charging of a solid, charge transfer is accomplished by the displacement of
A. both electrons and protons
B. protons, only
C. neither electrons nor protons
D. electrons, only D
Back to Board

33. Random $300
An electrically neutral object can be attracted by a positively charged object because
A. like charges repel each other
B. the net charge in a closed system varies
C. the neutral body becomes charged by contact
D. the charges on a neutral body can be redistributed D
Back to Board

34. Random $400 A particle could have a charge of A. 0.8E–19 C
B. 1.2E–19 C
C. 3.2E–19 C
D. 4.1E–19 C C
Back to Board

35. Random $500
A rod is brought near an electroscope, and the leaves separate. What is the charge, if any, on the rod?
No charge
Positive charge
Negative charge
An unknown charge D
Back to Board