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E field Voltage prac
1. The diagram below represents the electric field surrounding two charged spheres. A and B.
What is the sign of the charge of each sphere?
A)
B)
C)
D)
Sphere A is positive and sphere B is negative.
Sphere A is negative and sphere B is positive.
Both spheres are positive.
Both spheres are negative
2. In the diagram below, proton p, neutron n, and electron e are located as shown between two oppositely
charged plates.
The magnitude of acceleration will be greatest for the
A)
B)
C)
D)
neutron, because it has the greatest mass
neutron, because it is neutral
electron, because it has the smallest mass
proton, because it is farthest from the negative
plate
3. An electron is located in an electric field of magnitude 600. newtons per coulomb. What is the
magnitude of the electrostatic force acting on the electron?
A) 3.75 × 10 21 N
B) 6.00 × 10 2 N
C) 9.60 × 10 –17 N D) 2.67 × 10 –22 N
4. What is the total amount of work required to move a proton through a potential difference of 100.
volts?
A) 1.60 × 10 –21 J
B) 1.60 × 10
–17
J C) 1.00 × 10 2 J
D) 6.25 × 10 20 J
5. Which electrical unit is equivalent to one joule?
A) volt per meter
C) volt per coulomb
B) ampere · volt
D) coulomb· volt
6. How much work is required to move a single electron through a potential difference of 100. volts?
A) 1.6 × 10 –21 J
B) 1.6 × 10 –19 J
C) 1.6 × 10 –17 J
D) 1.0 × 10 2 J
7. A 12-volt automobile battery has 8.4 × 103 coulombs of electric charge. The amount of electrical
energy stored in the battery is approximately
A) 1.0 × 10 5 J
B) 8.4 × 10 3 J
C) 7.0 × 10 2 J
D) 1.4 × 10 –3 J
8. If 15 joules of work is required to move 3.0 coulombs of charge between two points, the potential
difference between these two points is
A) 45 V
B) 15 V
C) 3.0 V
D) 5.0 V
9. The work required to move 2 coulombs of charge through a potential difference of 5 volts is
A) 10 J
B) 2 J
C) 25 J
D) 50 J
10. The diagram below represents two electrons, e 1 and e 2, located between two oppositely charged
parallel plates
Compare the magnitude of the force exerted by the electric field on e 1 to the magnitude of the force
exerted by the electric field on e 2.
Base your answers to questions 11 and 12 on the following information.
The magnitude of the electric field strength between two oppositely charged parallel metal plates
is 2.0 × 103 newtons per coulomb. Point P is located midway between the plates.
11. On the diagram above, sketch at least five electric field lines to represent the field between the two
oppositely charged plates. [Draw an arrowhead on each field line to show the proper direction.]
12. An electron is located at point P between the plates. Calculate the magnitude of the force exerted on
the electron by the electric field. [Show all work, including the equation and substitution with units.]
13. Two oppositely charged parallel metal plates, 1.00 centimeter apart, exert a force with a magnitude of
3.60 × 10 -15 newton on an electron placed between the plates. Calculate the magnitude of the electric
field strength between the plates. [Show all work, including the equation and substitution with units.]
14. On the diagram below, sketch at least four electric field lines with arrowheads that represent the
electric field around a negatively charged conducting sphere.
15. What is the magnitude of the charge, in coulombs, of a lithium nucleus containing three protons and
four neutrons?