Electric Field: Concept of a Field Revisited Quiz
The question sheet
Reveal any answer as you study-
A field vector diagram shows charges R, S, T. What indicates that R and T are negative?
- Field vectors are zero at R and T
- Field points parallel at R and T
- Field points outward from R and T
- Field points inward toward R and T
Reveal answer
Answer: Field points inward toward R and T
Source evidence
PDF page 892: diagram that indicate that the sign of the charges of objects R and T is negative and that the sign of the charge of object S is positive. ii) Briefly describe the characteristics of the field diagram that indicate that the magnitudes of the charges of objects R and T are equal and that the
PDF page 892: The figure above represents the electric field in the vicinity of three small charged objects, R, S, and T. The objects have charges −q, +2q, and −q, respectively, and are located on the x-axis at −d, 0, and d. Field vectors of very large magnitude are omitted for clarity.
-
In the field diagram, what indicates that object S has a positive charge?
- Field bends around S
- Field is zero at S
- Field vectors point outward from S
- Field vectors point inward at S
Reveal answer
Answer: Field vectors point outward from S
Source evidence
PDF page 892: diagram that indicate that the sign of the charges of objects R and T is negative and that the sign of the charge of object S is positive. ii) Briefly describe the characteristics of the field diagram that indicate that the magnitudes of the charges of objects R and T are equal and that the
PDF page 892: The figure above represents the electric field in the vicinity of three small charged objects, R, S, and T. The objects have charges −q, +2q, and −q, respectively, and are located on the x-axis at −d, 0, and d. Field vectors of very large magnitude are omitted for clarity.
-
In the diagram, objects R, S, and T carry which charges respectively?
- +q, -2q, +q
- +2q, -q, +2q
- -q, +2q, -q
- -2q, +q, -2q
Reveal answer
Answer: -q, +2q, -q
Source evidence
PDF page 892: The figure above represents the electric field in the vicinity of three small charged objects, R, S, and T. The objects have charges −q, +2q, and −q, respectively, and are located on the x-axis at −d, 0, and d. Field vectors of very large magnitude are omitted for clarity.
-
In the diagram, objects R, S, and T are located on the x-axis at which positions?
- -d, 0, d
- 0, d, 2d
- d, 2d, 3d
- -2d, 0, 2d
Reveal answer
Answer: -d, 0, d
Source evidence
PDF page 892: The figure above represents the electric field in the vicinity of three small charged objects, R, S, and T. The objects have charges −q, +2q, and −q, respectively, and are located on the x-axis at −d, 0, and d. Field vectors of very large magnitude are omitted for clarity.
-
The magnitude of S's charge is about how much compared to R and T?
- Half of each
- Equal to each
- Four times each
- Twice each
Reveal answer
Answer: Twice each
Source evidence
PDF page 892: diagram that indicate that the sign of the charges of objects R and T is negative and that the sign of the charge of object S is positive. ii) Briefly describe the characteristics of the field diagram that indicate that the magnitudes of the charges of objects R and T are equal and that the
-
For the field-graph problem, an electric field directed to the right is defined as:
- Negative
- Positive
- Undefined
- Zero
Reveal answer
Answer: Positive
Source evidence
PDF page 892: magnitude of the charge of object S is about twice that of objects R and T. For the following parts, an electric field directed to the right is defined to be positive.
-
The expression requested for E between S and T is written in terms of:
- q, d, and fundamental constants
- time and charge
- mass and velocity
- voltage and area
Reveal answer
Answer: q, d, and fundamental constants
Source evidence
PDF page 892: (c) Write an expression for the electric field E along
PDF page 892: the x-axis as a function of position x in the region between objects S and T in terms of q, d, and fundamental constants, as appropriate.
-
A classmate claims there is a point between S and T where the field is:
- Maximum
- Zero
- Constant
- Infinite
Reveal answer
Answer: Zero
Source evidence
PDF page 892: (d) Your classmate tells you there is a point between
PDF page 892: S and T where the electric field is zero. Determine whether this statement is true, and explain your reasoning using two of the representations from parts (a), (b), or (c).
-
The graph requested in part (b) plots the electric field E as a function of:
- Position x
- Velocity
- Charge q
- Time
Reveal answer
Answer: Position x
Source evidence
PDF page 892: (b) On the axes below, sketch a graph of the electric
PDF page 892: field E along the x-axis as a function of position x.
-
To justify the zero-field claim, the student should use how many representations?
- Four
- Three
- One
- Two
Reveal answer
Answer: Two
Source evidence
PDF page 892: S and T where the electric field is zero. Determine whether this statement is true, and explain your reasoning using two of the representations from parts (a), (b), or (c).
-
Field vectors of very large magnitude are omitted from the diagram for the sake of:
- Accuracy
- Symmetry
- Clarity
- Scale
Reveal answer
Answer: Clarity
Source evidence
PDF page 892: The figure above represents the electric field in the vicinity of three small charged objects, R, S, and T. The objects have charges −q, +2q, and −q, respectively, and are located on the x-axis at −d, 0, and d. Field vectors of very large magnitude are omitted for clarity.
-
In the square problem, objects X and Z are located at:
- The midpoints of the sides
- Outside the square
- The center of the square
- The corners of the square
Reveal answer
Answer: The midpoints of the sides
Source evidence
PDF page 891: Four objects, each with charge +q, are held fixed on a square with sides of length d, as shown in the figure. Objects X and Z are at the midpoints of the sides of the square. The electrostatic force exerted by object W on object X is F. Use this information to answer questions 39–40. What is the magnitude of force exerted by object W on Z?
AP College Physics
AP College Physics by OpenStax, used under CC BY 4.0. Changes made by Stratacademy.
Make your own — free
Turn any notes into a game in under a minute. Free to start.