Question 1

A +4.0-μC and a -4.0-μC point charge are placed as shown in the figure.What is the potential difference between points A and B? (k = 1/4πε0 = 9.0 × 109 N ∙ m2/C2)  0 = 9.0 × 109 N ∙ m2/C2)    A) 48 V B) 96 V C) 0 V D) 96 kV E) 48 kV" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  48 V
B)  96 V
C)  0 V
D)  96 kV
E)  48 kVF) A) and D)
G) A) and E)

Question 2

An ideal,isolated,air-filled parallel-plate capacitor is not connected to a battery but has equal and opposite charges of 3.9 nC on its plates.The separation between the plates initially is 1.2 mm,and for this separation the capacitance is 3.1 × 10-11 F.How much work must be done to pull the plates apart until their separation becomes 7.7 mm? (ε0 = 8.85 × 10-12 C2/N ∙ m2)

Accepted Answer

Question 3

A parallel-plate capacitor consists of a set of two parallel plates of area A separated by a distance d.This capacitor is connected to a battery that maintains a constant potential difference across the plates.A slab of a dielectric material is inserted in the region between the plates and completely fills it.What changes would you observe as the dielectric is inserted? (There could be more than one correct choice.)

Accepted Answer

A)  Only the charge on the plates of the capacitor would change.
B)  Only the capacitance would change.
C)  Both the charge on the plates of the capacitor and its capacitance would change.
D)  The potential difference across the plates would increase.
E)  Nothing would change.F) A) and B)
G) B) and D)

Question 4

When a 12.0-V battery causes 2.00 μC of charge to flow onto the plates of an air-filled capacitor,how much work did the battery do?

Accepted Answer

A)  24.0 μJ
B)  12.0 μJ
C)  144 μJ
D)  576 JE) B) and D)
F) All of the above

Question 5

The electron-volt is a unit of

Accepted Answer

A)  charge.
B)  electric potential.
C)    E⃗\vec { E }E3.333 2.667 6.667 9 10 19 6.667 24.667 20.333 43.667 41 57 7.333 4.667 1110.667 11 18 0 6-1 10-3 12s-6.667 5-14 9c-28.667 14.667-53.667 35.667-75 63-1.333 1.333-3.167 3.5-5.5 6.5s-4 4.833-5 5.5c-1 .667-2.5 1.333-4.5 2s-4.333 1-7 1c-4.667 0-9.167-1.833-13.5-5.5S337 184 337 178c0-12.667 15.667-32.333 47-59H213l-171-1c-8.667-6-13-12.333-13-19 0-4.667 4.333-11.333 13-20h359c-16-25.333-24-45-24-59z'/>  field.
D)  electric force.
E)  energy. F) A) and E)
G) A) and B)

Question 6

As an electron moves in the direction the  E⃗\vec { E }E  field lines

Accepted Answer

A)  it is moving from the field's low potential to high potential and the electric potential energy of the system electron-electric field is increasing.
B)  it is moving from the field's low potential to high potential and the electric potential energy of the system electron-electric field is decreasing.
C)  it is moving from the field's high potential to low potential and the electric potential energy of the system electron-electric field is increasing.
D)  it is moving from the field's high potential to low potential and the electric potential energy of the system electron-electric field is decreasing.
E)  both the electric potential and electric potential energy of the system electron-electric field remain constant. F) B) and C)
G) A) and C)

Question 7

Two point charges of +2.00 μC and +4.00 μC are at the origin and at the point x = 0.000 m,y = -0.300 m,as shown in the figure.What is the electric potential due to these charges,relative to infinity,at the point P at x = 0.400 m on the x-axis? (k = 1/4πε0 = 8.99 × 109 N ∙ m2/C2)  0 = 8.99 × 109 N ∙ m2/C2)    A) 117 kV B) 15.7 kV C) 11.7 kV D) 56.0 kV E) 36.0 kV" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  117 kV
B)  15.7 kV
C)  11.7 kV
D)  56.0 kV
E)  36.0 kVF) A) and B)
G) D) and E)

Question 8

An ideal parallel-plate capacitor consists of two parallel plates of area A separated by a distance d.This capacitor is connected to a battery and charged until its plates carry charges +Q and -Q,and the battery is then disconnected.If the separation between the plates is now doubled,the electrical energy stored in the capacitor will

Accepted Answer

A)  double.
B)  quadruple.
C)  be cut in half.
D)  be cut in fourth.
E)  not change.F) A) and E)
G) A) and C)

Question 9

An air-filled capacitor has a potential difference between the plates of 80 V.If the charge on each of the plates of the capacitor has magnitude 8.0 μC,what is the electrical energy stored by this capacitor?

Accepted Answer

A)  640 µJ
B)  320 µJ
C)  50 nJ
D)  60 nJ
E)  30 pJF) A) and D)
G) A) and C)

Question 10

An ideal parallel-plate capacitor consists of two parallel plates of area A separated by a distance d.This capacitor is connected across a battery that maintains a constant potential difference between the plates.If the separation between the plates is now doubled,the magnitude of the charge on the plates will

Accepted Answer

A)  double.
B)  quadruple.
C)  be cut in half.
D)  be cut in fourth.
E)  not change.F) D) and E)
G) A) and D)

Question 11

The square plates of a 5000-pF parallel-plate capacitor measure 50 mm by 50 mm and are separated by a dielectric that is  0.23 mm0.23 \mathrm {~mm}0.23 mm  thickand totally fills the region between the plates.The voltage rating (the maximum safe voltage) of the capacitor is  400 V400 \mathrm {~V}400 V  What is the maximum energy that can be stored in this capacitor without damaging it? (ε0 = 8.85 × 10-12 C2/N ∙ m2)

Accepted Answer

A)  0.40 mJ
B)  0.50 mJ
C)  0.60 mJ
D)  0.70 mJ
E)  0.80 mJ F) A) and B)
G) A) and C)

Question 12

Three equal-magnitude point charges of varying signs are placed at the corners of a square of side d as shown in the figure.Which one of the arrows shown represents the direction of the net  E⃗\vec { E }E  field at the center of the square?

Accepted Answer

A)  A
B)  B
C)  C
D)  D E) None of the above
F) A) and B)

Question 13

The figure shows two unequal charges,+q and -Q.Charge -Q has greater magnitude than charge +q.Point X is midway between the charges.In what section of the line will there be a point where the resultant  E⃗\vec { E }E  field is zero?

Accepted Answer

A)  VW
B)  WX
C)  XY
D)  YZ E) A) and D)
F) All of the above

Question 14

At a distance d from a point charge Q,the energy density in its electric field is u.If we now go to a distance d/2 from the charge,what is the energy density at the new location?

Accepted Answer

A)  16u
B)  8u
C)  4u
D)  2u
E)  u  2\sqrt { 2 }2c-2.7,0,-7.17,-2.7,-13.5,-8c-5.8,-5.3,-9.5,-10,-9.5,-14c0,-2,0.3,-3.3,1,-4c1.3,-2.7,23.83,-20.7,67.5,-54c44.2,-33.3,65.8,-50.3,66.5,-51c1.3,-1.3,3,-2,5,-2c4.7,0,8.7,3.3,12,10s173,378,173,378c0.7,0,35.3,-71,104,-213c68.7,-142,137.5,-285,206.5,-429c69,-144,104.5,-217.7,106.5,-221l0 -0c5.3,-9.3,12,-14,20,-14H400000v40H845.2724s-225.272,467,-225.272,467s-235,486,-235,486c-2.7,4.7,-9,7,-19,7c-6,0,-10,-1,-12,-3s-194,-422,-194,-422s-65,47,-65,47zM834 80h400000v40h-400000z'/>​F) A) and D)
G) D) and E)

Question 15

A space probe approaches a planet,taking measurements as it goes.If it detects a potential difference of 6000 MV between the altitudes of 253,000 km and 276,000 km above the planet's surface,what is the approximate electric field strength produced by the planet at 264,500 km above the surface? Assume the  E⃗\vec { E }E  field is approximately constant at these altitudes.

Accepted Answer

A)  261 N/C
B)  0.261 N/C
C)  561 N/C
D)  493 μN/C E) All of the above
F) None of the above

Question 16

A uniform electric field has the strength of  7.0 N/C7.0 \mathrm {~N} / \mathrm { C }7.0 N/C  What is the electric energy density of this field? (ε0 = 8.85 × 10-12 C2/N ∙ m2)

Accepted Answer

A)  2.2 × 10-10 J/m3
B)  3.1 × 10-11 J/m3
C)  2.8 × 1012 J/m3
D)  5.5 × 1012 J/m3 E) All of the above
F) None of the above

Question 17

Which of the following will increase the capacitance of a parallel-plate capacitor? (There could be more than one correct choice.)

Accepted Answer

A)  a decrease in the plate area and an increase in the plate separation
B)  a decrease in the potential difference between the plates
C)  an increase in the potential difference between the plates
D)  an increase in the plate area and a decrease in the plate separation
E)  an increase in the charge on the platesF) A) and E)
G) D) and E)

Question 18

An ideal air-filled parallel plate capacitor with plate a separation of 4.0 cm has a plate area of 0.040 m2.What is the capacitance of this capacitor with air between these plates? (ε0 = 8.85 × 10-12 C2/N ∙ m2)

Accepted Answer

A)  89 pF
B)  8.9 pF
C)  0.89 pF
D)  8.9 µF
E)  8.9 nFF) A) and C)
G) C) and E)

Question 19

When the magnitude of the charge on each plate of an air-filled capacitor is 4 μC,the potential difference between the plates is 80 V.What is the capacitance of this capacitor?

Accepted Answer

A)  0.1 µF
B)  50 µF
C)  100 µF
D)  20 µF
E)  50 nFF) All of the above
G) B) and D)

Question 20

A conductor is placed in a steady external electric field.Which of the following statements are correct for this situation? (There could be more than one correct choice.)

Accepted Answer

A)  The electric field is zero inside the conductor.
B)  All the free electrons go to the surface of the conductor.
C)  The surface of the conductor is neutral.
D)  The electric field just outside the surface of the conductor is perpendicular to the surface.
E)  None of the above statements are correct.F) None of the above
G) A) and E)

Exam 16: The Electric Field

An ideal air-filled parallel plate capacitor with plate a separation of 4.0 cm has a plate area of 0.040 m².What is the capacitance of this capacitor with air between these plates? (ε₀ = 8.85 × 10^-12C²/N ∙ m²)

Correct Answer
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A uniform electric field has the strength of $7.0 \mathrm {~N} / \mathrm { C }$ What is the electric energy density of this field? (ε₀ = 8.85 × 10^-12C²/N ∙ m²)

Correct Answer
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Correct Answer
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A +4.0-μC and a -4.0-μC point charge are placed as shown in the figure.What is the potential difference between points A and B? (k = 1/4πε₀ = 9.0 × 10⁹ N ∙ m²/C²)

Correct Answer
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When a 12.0-V battery causes 2.00 μC of charge to flow onto the plates of an air-filled capacitor,how much work did the battery do?

Correct Answer
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Which of the following will increase the capacitance of a parallel-plate capacitor? (There could be more than one correct choice.)

Correct Answer
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As an electron moves in the direction the $\vec { E }$ field lines

Correct Answer
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At a distance d from a point charge Q,the energy density in its electric field is u.If we now go to a distance d/2 from the charge,what is the energy density at the new location?

Correct Answer
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Two point charges of +2.00 μC and +4.00 μC are at the origin and at the point x = 0.000 m,y = -0.300 m,as shown in the figure.What is the electric potential due to these charges,relative to infinity,at the point P at x = 0.400 m on the x-axis? (k = 1/4πε₀ = 8.99 × 10⁹ N ∙ m²/C²)

Correct Answer
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Correct Answer
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When the magnitude of the charge on each plate of an air-filled capacitor is 4 μC,the potential difference between the plates is 80 V.What is the capacitance of this capacitor?

Correct Answer
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Correct Answer
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Correct Answer
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The electron-volt is a unit of

Correct Answer
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An air-filled capacitor has a potential difference between the plates of 80 V.If the charge on each of the plates of the capacitor has magnitude 8.0 μC,what is the electrical energy stored by this capacitor?

Correct Answer
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Correct Answer
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A conductor is placed in a steady external electric field.Which of the following statements are correct for this situation? (There could be more than one correct choice.)

Correct Answer
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Exam 16: The Electric Field

An ideal air-filled parallel plate capacitor with plate a separation of 4.0 cm has a plate area of 0.040 m2.What is the capacitance of this capacitor with air between these plates? (ε0 = 8.85 × 10-12 C2/N ∙ m2)

Correct AnswerverifiedShow Answer

A uniform electric field has the strength of 7.0 N/C7.0 \mathrm {~N} / \mathrm { C }7.0 N/C What is the electric energy density of this field? (ε0 = 8.85 × 10-12 C2/N ∙ m2)

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

A +4.0-μC and a -4.0-μC point charge are placed as shown in the figure.What is the potential difference between points A and B? (k = 1/4πε0 = 9.0 × 109 N ∙ m2/C2)

Correct AnswerverifiedShow Answer

When a 12.0-V battery causes 2.00 μC of charge to flow onto the plates of an air-filled capacitor,how much work did the battery do?

Correct AnswerverifiedShow Answer

Which of the following will increase the capacitance of a parallel-plate capacitor? (There could be more than one correct choice.)

Correct AnswerverifiedShow Answer

As an electron moves in the direction the E⃗\vec { E }E field lines

Correct AnswerverifiedShow Answer

At a distance d from a point charge Q,the energy density in its electric field is u.If we now go to a distance d/2 from the charge,what is the energy density at the new location?

Correct AnswerverifiedShow Answer

Two point charges of +2.00 μC and +4.00 μC are at the origin and at the point x = 0.000 m,y = -0.300 m,as shown in the figure.What is the electric potential due to these charges,relative to infinity,at the point P at x = 0.400 m on the x-axis? (k = 1/4πε0 = 8.99 × 109 N ∙ m2/C2)

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

When the magnitude of the charge on each plate of an air-filled capacitor is 4 μC,the potential difference between the plates is 80 V.What is the capacitance of this capacitor?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Three equal-magnitude point charges of varying signs are placed at the corners of a square of side d as shown in the figure.Which one of the arrows shown represents the direction of the net E⃗\vec { E }E field at the center of the square?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

The figure shows two unequal charges,+q and -Q.Charge -Q has greater magnitude than charge +q.Point X is midway between the charges.In what section of the line will there be a point where the resultant E⃗\vec { E }E field is zero?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

The electron-volt is a unit of

Correct AnswerverifiedShow Answer

An air-filled capacitor has a potential difference between the plates of 80 V.If the charge on each of the plates of the capacitor has magnitude 8.0 μC,what is the electrical energy stored by this capacitor?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

A conductor is placed in a steady external electric field.Which of the following statements are correct for this situation? (There could be more than one correct choice.)

Correct AnswerverifiedShow Answer

An ideal air-filled parallel plate capacitor with plate a separation of 4.0 cm has a plate area of 0.040 m².What is the capacitance of this capacitor with air between these plates? (ε₀ = 8.85 × 10^-12C²/N ∙ m²)

Correct Answer
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A uniform electric field has the strength of $7.0 \mathrm {~N} / \mathrm { C }$ What is the electric energy density of this field? (ε₀ = 8.85 × 10^-12C²/N ∙ m²)

Correct Answer
verified

Correct Answer
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A +4.0-μC and a -4.0-μC point charge are placed as shown in the figure.What is the potential difference between points A and B? (k = 1/4πε₀ = 9.0 × 10⁹ N ∙ m²/C²)

Correct Answer
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Correct Answer
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Correct Answer
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As an electron moves in the direction the $\vec { E }$ field lines

Correct Answer
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Correct Answer
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Two point charges of +2.00 μC and +4.00 μC are at the origin and at the point x = 0.000 m,y = -0.300 m,as shown in the figure.What is the electric potential due to these charges,relative to infinity,at the point P at x = 0.400 m on the x-axis? (k = 1/4πε₀ = 8.99 × 10⁹ N ∙ m²/C²)

Correct Answer
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Correct Answer
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Correct Answer
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