Question 1

At what distance from a 1.0-C charge is the electric potential equal to 12 V?

Accepted Answer

A) 8.3 × 107 m 
B) 7.5 × 108 m 
C) 9.0 × 108 m 
D) 1.1 × 109 m 
E) 3.0 × 109 m 
A) 8.3 × 107 m 
B) 7.5 × 108 m 
C) 9.0 × 108 m 
D) 1.1 × 109 m 
E) 3.0 × 109 m

Question 2

The sketch below shows cross sections of equipotential surfaces between two charged conductors that are shown in solid grey. Various points on the equipotential surfaces near the conductors are labeled A, B, C, ..., I.  
-At which of the labeled points will an electron have the greatest potential energy?

Accepted Answer

A) A 
B) D 
C) G 
D) H 
E) I 
A) A 
B) D 
C) G 
D) H 
E) I

Question 3

Two positive charges are located at points A and B as shown in the figure. The distance from each charge to the point P is a = 2.0 m.  
-Which statement is true concerning the direction of the electric field at P?

Accepted Answer

A) The direction is toward A. 
B) The direction is toward B. 
C) The direction is directly away from A. 
D) The direction makes a 45° angle above the horizontal direction. 
E) The direction makes a 135° angle below the horizontal direction. 
A) The direction is toward A. 
B) The direction is toward B. 
C) The direction is directly away from A. 
D) The direction makes a 45° angle above the horizontal direction. 
E) The direction makes a 135° angle below the horizontal direction.

Question 4

Which one of the following statements best describes the equipotential surfaces surrounding a point charge?

Accepted Answer

A) The equipotential surfaces are planes extending radially outward from the charge. 
B) The equipotential surfaces are curved planes surrounding the charge, but only one passes through the charge. 
C) The equipotential surfaces are concentric cubes with the charge at the center. 
D) The equipotential surfaces are concentric spheres with the charge at the center. 
E) The equipotential surfaces are concentric cylinders with the charge on the axis at the center. 
A) The equipotential surfaces are planes extending radially outward from the charge. 
B) The equipotential surfaces are curved planes surrounding the charge, but only one passes through the charge. 
C) The equipotential surfaces are concentric cubes with the charge at the center. 
D) The equipotential surfaces are concentric spheres with the charge at the center. 
E) The equipotential surfaces are concentric cylinders with the charge on the axis at the center.

Question 5

The plates of a parallel plate capacitor each have an area of 0.40 mS1U1P12S1S1P0 and are separated by a distance of 0.02 m. They are charged until the potential difference between the plates is 3000 V. The charged capacitor is then isolated.
-Determine the magnitude of the electric field between the capacitor plates.

Accepted Answer

A) 60 V/m 
B) 120 V/m 
C) 1.0 × 105 V/m 
D) 1.5 × 105 V/m 
E) 3.0 × 105 V/m 
A) 60 V/m 
B) 120 V/m 
C) 1.0 × 105 V/m 
D) 1.5 × 105 V/m 
E) 3.0 × 105 V/m

Question 6

A +1.0 $\mu$C point charge is moved from point A to B in the uniform electric field as shown. Which one of the following statements is necessarily true concerning the potential energy of the point charge?

Accepted Answer

A) The potential energy increases by 6.0 × 10-6J. 
B) The potential energy decreases by 6.0 × 10-6 J. 
C) The potential energy decreases by 9.0 × 10-6 J. 
D) The potential energy increases by 10.8 × 10-6 J. 
E) The potential energy decreases by 10.8 × 10-6 J. 
A) The potential energy increases by 6.0 × 10-6J. 
B) The potential energy decreases by 6.0 × 10-6 J. 
C) The potential energy decreases by 9.0 × 10-6 J. 
D) The potential energy increases by 10.8 × 10-6 J. 
E) The potential energy decreases by 10.8 × 10-6 J.

Question 7

Two charges of opposite sign and equal magnitude Q = 0.82 C are held 2.0 m apart as shown in the figure.  
-How much work is required to move a 1.0 C charge from infinity to the point P?

Accepted Answer

A) zero joules 
B) 2.2 × 109 J 
C) 4.5 × 109 J 
D) 9.0 × 109 J 
E) infinity 
A) zero joules 
B) 2.2 × 109 J 
C) 4.5 × 109 J 
D) 9.0 × 109 J 
E) infinity

Question 8

Which one of the following statements best explains why it is possible to define an electrostatic potential in a region of space that contains an electrostatic field?

Accepted Answer

A) Work must be done to bring two positive charges closer together. 
B) Like charges repel one another and unlike charges attract one another. 
C) A positive charge will gain kinetic energy as it approaches a negative charge. 
D) The work required to bring two charges together is independent of the path taken. 
E) A negative charge will gain kinetic energy as it moves away from another negative charge. 
A) Work must be done to bring two positive charges closer together. 
B) Like charges repel one another and unlike charges attract one another. 
C) A positive charge will gain kinetic energy as it approaches a negative charge. 
D) The work required to bring two charges together is independent of the path taken. 
E) A negative charge will gain kinetic energy as it moves away from another negative charge.

Question 9

Two point charges are arranged along the x axis as shown in the figure. At which of the following values of x is the electric potential equal to zero? Note: At infinity, the electric potential is zero.

Accepted Answer

A) +0.05 m 
B) +0.29 m 
C) +0.40 m 
D) +0.54 m 
E) +0.71 m 
A) +0.05 m 
B) +0.29 m 
C) +0.40 m 
D) +0.54 m 
E) +0.71 m

Question 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.  
-How much work is required to move a +6.0 µC point charge from B to F to D to A?

Accepted Answer

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 
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

At what distance from a 1.0-C charge is the electric potential equal to 12 V?

Two positive charges are located at points A and B as shown in the figure. The distance from each charge to the point P is a = 2.0 m. -Which statement is true concerning the direction of the electric field at P?

Which one of the following statements best describes the equipotential surfaces surrounding a point charge?

Two charges of opposite sign and equal magnitude Q = 0.82 C are held 2.0 m apart as shown in the figure. -How much work is required to move a 1.0 C charge from infinity to the point P?

Which one of the following statements best explains why it is possible to define an electrostatic potential in a region of space that contains an electrostatic field?

Two point charges are arranged along the x axis as shown in the figure. At which of the following values of x is the electric potential equal to zero? Note: At infinity, the electric potential is zero.

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. -How much work is required to move a +6.0 µC point charge from B to F to D to A?

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Exam 19: Electric Potential Energy and the Electric Potential

At what distance from a 1.0-C charge is the electric potential equal to 12 V?

Two positive charges are located at points A and B as shown in the figure. The distance from each charge to the point P is a = 2.0 m. -Which statement is true concerning the direction of the electric field at P?

Which one of the following statements best describes the equipotential surfaces surrounding a point charge?

A +1.0 μ\muμ C point charge is moved from point A to B in the uniform electric field as shown. Which one of the following statements is necessarily true concerning the potential energy of the point charge?

Two charges of opposite sign and equal magnitude Q = 0.82 C are held 2.0 m apart as shown in the figure. -How much work is required to move a 1.0 C charge from infinity to the point P?

Which one of the following statements best explains why it is possible to define an electrostatic potential in a region of space that contains an electrostatic field?

Two point charges are arranged along the x axis as shown in the figure. At which of the following values of x is the electric potential equal to zero? Note: At infinity, the electric potential is zero.

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. -How much work is required to move a +6.0 µC point charge from B to F to D to A?

Introduction and Mathematical Concepts

Kinematics in One Dimension

Kinematics in Two Dimensions

Forces and Newtons Laws of Motion

Dynamics of Uniform Circular Motion

Work and Energy

Impulse and Momentum

Rotational Kinematics

Rotational Dynamics

Simple Harmonic Motion and Elasticity

Fluids

Temperature and Heat

The Transfer of Heat

The Ideal Gas Law and Kinetic Theory

Thermodynamics

Waves and Sound

The Principle of Linear Superposition and Interference Phenomena

Electric Forces and Electric Fields

Electric Circuits

Magnetic Forces and Magnetic Fields

Electromagnetic Induction

Alternating Current Circuits

Electromagnetic Waves

The Refl Ection of Light: Mirrors

The Refraction of Light: Lenses and Optical Instruments

Interference and the Wave Nature of Light

Special Relativity

Particles and Waves

The Nature of the Atom

Nuclear Physics and Radioactivity

Ionizing Radiation, Nuclear Energy, and Elementary Particles

Filters