Chapter 23 Conceptual Questions

The electric potential at a certain distance from a point charge can be represented by V. What is the value of the electric potential at twice the distance from the point charge? - At twice the distance, the electric potential is 4V. - At twice the distance, the electric potential remains V. - At twice the distance, the electric potential is V/4. - At twice the distance, the electric potential is V/2. - At twice the distance, the electric potential is 2V.

At twice the distance, the electric potential is V/2.

The graph in (Figure 2) plots the potential as a function of position along the x axis. Rank in order the magnitude of the electric field at the three points indicated. If the electric field has the same magnitude at two of the points, place them on top of each other.

C, A, B

A negatively charged object is located in a region of space where the electric field is uniform and points due north. The object may move a set distance d to the north, east, or south. Rank the three possible movements by the change in electric potential energy (Ue) of the object.

Greatest inc. to dec. in (Ue): North, East, South

The electric potential at a certain location from a point charge can be represented by V. What is the value of the electric potential at the same location if the strength of the charge is tripled? - If you triple the value of the charge, the electric potential is 3V. - If you triple the value of the charge, the electric potential is V/9. - If you triple the value of the charge, the electric potential is 9V. - If you triple the value of the charge, the electric potential remains V. - If you triple the value of the charge, the electric potential is V/3.

If you triple the value of the charge, the electric potential is 3V.

A positive charge is moved from point A to point B along an equipotential surface. How much work is performed or required in moving the charge? - No work is performed or required in moving the positive charge from point A to point B. - Work is both performed and required in moving the charge from point A to point B. - Work is performed in moving the positive charge from point A to point B. - Work is required in moving the positive charge from point A to point B.

No work is performed or required in moving the positive charge from point A to point B.

(Figure 1) shows four equipotential surfaces. The positively charged particle located at Point a can move to Points b, c, or d by the paths indicated. Along which path is the greatest work done on the particle by the electric field? - Path a to b - Path a to c - The work done is equal along all three paths. - Path a to d

Path a to b

A negative charge moves in a direction opposite to that of an electric field. What happens to the energy associated with the charge? - The electric potential energy of the charge decreases, and the kinetic energy increases. - The electric potential energy of the charge increases, and the kinetic energy decreases. - Both the electric potential energy and the kinetic energy of the charge decrease. - Both the electric potential energy and the kinetic energy of the charge increase.

The electric potential energy of the charge decreases, and the kinetic energy increases.

A positive charge moves in a direction opposite to that of an electric field. What happens to the energy associated with the charge? - Both the electric potential energy and the kinetic energy of the charge increase. - The electric potential energy of the charge increases, and the kinetic energy decreases. - Both the electric potential energy and the kinetic energy of the charge decrease. - The electric potential energy of the charge decreases, and the kinetic energy increases.

The electric potential energy of the charge increases, and the kinetic energy decreases.

A positive charge moves in the direction of an electric field. Which of the following statements are true? - The potential energy associated with the charge decreases. - The electric field does not do any work on the charge. - The amount of work done on the charge cannot be determined without additional information. - The electric field does positive work on the charge. - The potential energy associated with the charge increases. - The electric field does negative work on the charge.

The potential energy associated with the charge decreases. The amount of work done on the charge cannot be determined without additional information. The electric field does positive work on the charge.

A negative charge moves in the direction of an electric field. Which of the following statements are true? - The potential energy associated with the charge decreases. - The electric field does positive work on the charge. -The potential energy associated with the charge increases. - The electric field does not do any work on the charge. - The electric field does negative work on the charge. - The amount of work done on the charge cannot be determined without additional information.

The potential energy associated with the charge increases. The electric field does negative work on the charge. The amount of work done on the charge cannot be determined without additional information.

The figure shows the electric potential V at five locations in a uniform electric field. At which point is the electric potential the largest? - VA - VE - VD - VB - VC

VA

The figure shows the electric potential V at five locations in a uniform electric field. At which points is the electric potential equal? - VA - VE - VD - VB - VC

VB, VD

Which of the following statements are true? - When all charges are at rest, the surface of a conductor is always an equipotential surface. - Electric field lines and equipotential surfaces are always mutually perpendicular. - The potential energy of a test charge decreases as it moves along an equipotential surface. - The potential energy of a test charge increases as it moves along an equipotential surface. - An equipotential surface is a three-dimensional surface on which the electric potential is the same at every point.

When all charges are at rest, the surface of a conductor is always an equipotential surface. Electric field lines and equipotential surfaces are always mutually perpendicular. An equipotential surface is a three-dimensional surface on which the electric potential is the same at every point.