Static , Charge, and Electric Field Review
/ Name KEYPhysics / Period / Date
9x109 N·m2/C2 6.25x1018 subatomic particles 1.6x10-19 C E = F/q’
Choose the best answer.
Sauder 1415Page 1Review – Static, Charge, and Fields
1.Which subatomic particle is positively charged?
proton
2.Which subatomic particle is negatively charged?
electron
3.Two positive charges will? (attract/repel)
repel
4.Two negative charges will? (attract/repel)
repel
5.A positive charge and a negative charge will? (attract/repel)
attract
6.One object is used to charge another by conduction. Describe. Objects touch, electrons transferred. Objects end up having same charge
7.One object is used to charge another by induction and grounding. Describe.Objects do not touch, electrons rearrange. When grounded, electrons move into or out of the ground, Objects end up having opposite charge
8.When a positively charged object is brought close to the surface of a neutral object, what happens tothe positive charges at the surface?
Nothing. Protons do not move.
9.The distance between two charged objects is increased by a factor of 3. The force changes by a factor of?
Decreases 9 fold
10.Two charged objects create a force on one another. If the charge of one object is doubled, how does the resulting force change? Doubles
11.Draw diagrams for electrical fields with a + source and a - source; how is strength indicated; what are fields in reference to?
12.How is excess charge distributed between a charged and neutral sphere (same size) upon contact? Charge is distributed on the surface and equally between the two spheres
13.Electrical Field Intensity is measured in?
N/C
14.What is the Law of Conservation of Charge
Charge cannot be created nor destroyed. Charge can be transferred. Total charge remains the same
15.What is grounding?
Transfer of excess electrons through the ground
Sauder 1415Page 1Review – Static, Charge, and Fields
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16.43 C is equal to how many coulombs? 58cm is equal to how many meters?
4.3 x 10-5 C .58m
17.How many excess electrons are necessary to create a 50 C charge?
3.13 x 1014electrons
18.Three billion electrons will create what size charge?
4.8 x 10-10 C
19.An aluminum ball with a charge of -24 C touches a neutral aluminum ball. The balls are the
same size and both are insulated from their surroundings.
What will be the charge on each ball after they touch?Is the second ball charged by conduction, or by induction?
-12 C; conduction
20.Mrs. Sauder gives each of two balloons a –15 C charge.
What will be the force between them when they are 5 cm apart?
810 N
21. A 43 C charge exerts a force of 135 N on another charge that is 8.2 cm away.
What is the size of the second charge?
2.35 x 10-6 C
22. A 1.8 C test charge is located 3.6 cm from a 28 C charge. What is the size of the force on the test charge? What is the
electric field strength at that point?
350 N 1.94 x 108 N/C
23. An electric field causes a force of 0.28 N on a 3.6 C test charge. What is the intensity of the electric field?
7.78 x 104 N/C
24. What would be the magnitude of a test charge that experiences a force of 3.7 x 10-6 N at a point where the electric field
intensity is 3.2 x 10-3 N/C?
1.16 x 10-3 C
25. What force does a test charge of 1.6 x 10-13µC in an electric field with an intensity of 23.6N/C experience?
3.77 x 10-18 C
26. What is the field strength at a point 25mm from an electron? What is the direction?
-2.0 x 10-6N/C or 2.0 x 10-6N/C inward
27. Giventwo charges: charge A (+26µC), charge B(+14µC). Thedistances between the two charges is240mm. What is the
strength of the electric field at the midpoint between them?
7.25 x 106N/C towards B
Sauder 1415Page 1Review – Static, Charge, and Fields