Abington Heights High School
AP Physics
Electrostatic Potential Quiz 3
Select the answer that best completes the question.
1.
The sketch below shows cross sections of equipotential surfaces between two charged conductors that are shown in solid black. Various points on the equipotential surfaces near the conductors are labeled A, B, C, ..., I.
R-1 Ref 19-6

At which of the labeled points will an electron have the greatest potential energy?
A.A
B.D
C.G
D.H
E.I

2.
The sketch below shows cross sections of equipotential surfaces between two charged conductors that are shown in solid black. Various points on the equipotential surfaces near the conductors are labeled A, B, C, ..., I.
R-1 Ref 19-6

What is the potential difference between points B and E?
A.10 V
B.30 V
C.40 V
D.50 V
E.60 V

3.
The sketch below shows cross sections of equipotential surfaces between two charged conductors that are shown in solid black. Various points on the equipotential surfaces near the conductors are labeled A, B, C, ..., I.
R-1 Ref 19-6

What is the direction of the electric field at B?
A.toward A
B.toward D
C.toward C
D.into the page
E.up and out of the page

4.
The sketch below shows cross sections of equipotential surfaces between two charged conductors that are shown in solid black. Various points on the equipotential surfaces near the conductors are labeled A, B, C, ..., I.
R-1 Ref 19-6

How much work is required to move a -1 mC charge from A to E?
A.+3.0 ´ 10-5 J
B.-4.0 ´ 10-5 J
C.+7.0 ´ 10-5 J
D.-7.0 ´ 10-5 J
E.zero joules

5.
The sketch below shows cross sections of equipotential surfaces between two charged conductors that are shown in solid black. Various points on the equipotential surfaces near the conductors are labeled A, B, C, ..., I.
R-1 Ref 19-6

How much work is required to move a -1 mC charge from B to D to C?
A.+2.0 ´ 10-5 J
B.-2.0 ´ 10-5 J
C.+4.0 ´ 10-5 J
D.-4.0 ´ 10-5 J
E.zero joules

6.
The sketch below shows cross sections of equipotential surfaces between two charged conductors that are shown in solid black. Various points on the equipotential surfaces near the conductors are labeled A, B, C, ..., I.
R-1 Ref 19-6

A positive point charge is placed at F. Complete the following statement: When it is released,
A.no force will be exerted on it.
B.a force will cause it to move toward E.
C.a force will cause it to move toward G.
D.a force will cause it to move away from E.
E.it would subsequently lose kinetic energy.

7.
The sketch below shows cross sections of equipotential surfaces between two charged conductors that are shown in solid black. Various points on the equipotential surfaces near the conductors are labeled A, B, C, ..., I.
R-1 Ref 19-6

What is the magnitude of the electric field at point A?
A.10 V/m
B.25 V/m
C.30 V/m
D.75 V/m
E.100 V/m

8.
The sketch below shows cross sections of equipotential surfaces between two charged conductors that are shown in solid black. Various points on the equipotential surfaces near the conductors are labeled A, B, C, ..., I.
R-1 Ref 19-6

A point charge gains 50 mJ of electric potential energy when it is moved from point D to point G. Determine the magnitude of the charge.
A.1.0 mC
B.1.3 mC
C.25 mC
D.50 mC
E.130 mC

9.
The sketch shows cross sections of equipotential surfaces between two charged conductors shown in solid black. Points on the equipotential surfaces near the conductors are labeled A, B, C, ..., H.
R-2 Ref 19-7

What is the magnitude of the potential difference between points A and H?
A.100 V
B.200 V
C.400 V
D.600 V
E.700 V

10.
The sketch shows cross sections of equipotential surfaces between two charged conductors shown in solid black. Points on the equipotential surfaces near the conductors are labeled A, B, C, ..., H.
R-2 Ref 19-7

What is the direction of the electric field at point E?
A.toward G
B.toward B
C.toward H
D.toward C
E.toward F

11.
The sketch shows cross sections of equipotential surfaces between two charged conductors shown in solid black. Points on the equipotential surfaces near the conductors are labeled A, B, C, ..., H.
R-2 Ref 19-7

How much work is required to move a +6 µC point charge from B to F to D to A?
A.+1.2 ´ 10-3 J
B.-1.2 ´ 10-3 J
C.+3.6 ´ 10-3 J
D.-3.6 ´ 10-3 J
E.zero joules

12. The magnitude of the charge on the plates of an isolated parallel plate capacitor is doubled. Which one of the following statements is true concerning the capacitance of this parallel-plate system?
A.The capacitance is decreased to one half of its original value.
B.The capacitance is increased to twice its original value.
C.The capacitance remains unchanged.
D.The capacitance depends on the electric field between the plates.
E.The capacitance depends on the potential difference across the plates.
13. A parallel plate capacitor with plates of area A and plate separation d is charged so that the potential difference between its plates is V. If the capacitor is then isolated and its plate separation is decreased to d/2, what happens to the potential difference between the plates?
A.The potential difference is increased by a factor of four.
B.The potential difference is twice it original value.
C.The potential difference is one half of its original value.
D.The potential difference is one fourth of its original value.
E.The potential difference is unchanged.
14. A parallel plate capacitor with plates of area A and plate separation d is charged so that the potential difference between its plates is V. If the capacitor is then isolated and its plate separation is decreased to d/2, what happens to its capacitance?
A.The capacitance is twice its original value.
B.The capacitance is four times its original value.
C.The capacitance is eight times its original value.
D.The capacitance is one half of its original value.
E.The capacitance is unchanged.
15. A parallel plate capacitor is fully charged at a potential V. A dielectric with constant k = 4 is inserted between the plates of the capacitor while the potential difference between the plates remains constant. Which one of the following statements is false concerning this situation?
A.The energy density remains unchanged.
B.The capacitance increases by a factor of four.
C.The stored energy increases by a factor of four.
D.The charge on the capacitor increases by a factor of four.
E.The electric field between the plates increases by a factor of four.

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