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Chapter 16: Q22Q (page 443)
A point charge is surrounded by a spherical gaussian surface of radius r. If the sphere is replaced by a cube of side r, will \({\phi _{\rm{E}}}\) be larger, smaller, or the same? Explain.
The electric flux \({\phi _{\rm{E}}}\) will be the same.
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(II) Determine the magnitude of the acceleration experienced by an electron in an electric field of\({\bf{756 N/C}}\).How does the direction of the acceleration depend on the direction of the field at that point?
(II) Two charged dust particles exert a force of\({\bf{4}}{\bf{.2 \times 1}}{{\bf{0}}^{{\bf{ - 2}}}}\;{\bf{N}}\)on each other. What will be the force if they are moved so they are only one-eighth as far apart?
Figure 16–50 shows electric field lines due to a point charge. What can you say about the field at point 1 compared with the field at point 2?
(a) The field at point 2 is larger, because point 2 is on a field line.
(b) The field at point 1 is larger, because point 1 is not on a field line.
(c) The field at point 1 is zero, because point 1 is not on a field line.
(d) The field at point 1 is larger, because the field lines are closer together in that region.
A negative point charge is in an electric field created by a positive point charge. Which of the following is true?
(a) The field points toward the positive charge, and the force on the negative charge is in the same direction as the field.
(b) The field points toward the positive charge, and the force on the negative charge is in the opposite direction to the field.
(c) The field points away from the positive charge, and the force on the negative charge is in the same direction as the field.
(d) The field points away from the positive charge, and the force on the negative charge is in the opposite direction to the field.
Swap the positions of \({Q_1}\) and \({Q_2}\) of Mis Conceptual Question 1. Which of the following is true of the force on \({Q_1}\) due to\({Q_2}\)?
(a) It does not change.
(b) It changes from attractive to repulsive.
(c) It changes from repulsive to attractive.
(d) It changes from \( + x\) the direction to the \( - x\) direction.
(e) It changes from the \( - x\) direction to the \( + x\) direction
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