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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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Draw the electric field lines surrounding two negative electric charges a distance l apart.
When an electroscope is charged, its two leaves repel each other and remain at an angle. What balances the electric force of repulsion so that the leaves don’t separate further?
A point charge of mass 0.185 kg, and net charge\( + {\bf{0}}{\bf{.340 }}\mu {\bf{C}}\)hangs at rest at the end of an insulating cord above a large sheet of charge. The horizontal sheet of fixed uniform charge creates a uniform vertical electric field in the vicinity of the point charge. The tension in the cord is measured to be 5.18 N. Calculate the magnitude and direction of the electric field due to the sheet of charge (Fig. 16–67).
FIGURE 16–67 Problem 61.
(II) A cube of side 8.50 cm is placed in a uniform field \({\bf{E = 7}}{\bf{.50 \times 1}}{{\bf{0}}^{\bf{3}}}\;{\bf{N/C}}\) with edges parallel to the field lines. (a) What is the net flux through the cube? (b) What is the flux through each of its six faces?
When a charged ruler attracts small pieces of paper, sometimes a piece jumps quickly away after touching the ruler. Explain.
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