Chapter 16: Q3Q (page 443)
Explain why fog or rain droplets tend to form around ions or electrons in the air.
Due to the polarity of the water molecules, they are affected by ions or electrons in the air.
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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
Consider the electric field at the three points indicated by the letters A, B, and C in Fig. 16–49. First draw an arrow at each point indicating the direction of the net force that a positive test charge would experience if placed at that point, then list the letters in order of decreasing field strength (strongest first). Explain.
A point charge \(\left( {m = 1.0 gram} \right)\) at the end of an insulating cord of length 55 cm is observed to be in equilibrium in a uniform horizontal electric field of \(9500 N/C\), when the pendulum’s position is as shown in Fig. 16–66, with the charge 12 cm above the lowest (vertical) position. If the field points to the right in Fig. 16–66, determine the magnitude and sign of the point charge.
FIGURE 16–66 Problem 57.
(II) Two point charges, \({{\bf{Q}}_{\bf{1}}}{\bf{ = - 32}}\;{\bf{\mu C}}\) and \({{\bf{Q}}_{\bf{2}}}{\bf{ = + 45}}\;{\bf{\mu C}}\) are separated by a distance of 12 cm. The electric field at point P (see Fig. 16–57) is zero. How far from \({{\bf{Q}}_{\bf{1}}}\) is P?
(II) What is the total charge of all the electrons in a 12-kg bar of gold? What is the net charge of the bar? (Gold has 79 electrons per atom and an atomic mass of 197 u.)
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