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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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(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鈥�57) is zero. How far from \({{\bf{Q}}_{\bf{1}}}\) is P?
As an object acquires a positive charge, its mass usually
(a) decreases.
(b) increases.
(c) stays the same.
(d) becomes negative.
(I) A proton is released in a uniform electric field, and it experiences an electric force of\({\bf{1}}{\bf{.86}} \times {\bf{1}}{{\bf{0}}^{ - {\bf{14}}}}{\bf{ N}}\)toward the south. Find the magnitude and direction of the electric field.
(II) Compare the electric force holding the electron in orbit\(\left( {{\bf{r = 0}}{\bf{.53 \times 1}}{{\bf{0}}^{{\bf{ - 10}}}}\;{\bf{m}}} \right)\)around the proton nucleus of the hydrogen atom, with the gravitational force between the same electron and proton. What is the ratio of these two forces?
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鈥檚 position is as shown in Fig. 16鈥�66, with the charge 12 cm above the lowest (vertical) position. If the field points to the right in Fig. 16鈥�66, determine the magnitude and sign of the point charge.
FIGURE 16鈥�66 Problem 57.
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