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Chapter 16: Q4Q (page 443)
Why does a plastic ruler that has been rubbed with a cloth have the ability to pick up small pieces of paper? Why is this difficult to do on a humid day?
Due to the generation of static energy.
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Packing material made of pieces of foamed polystyrene can easily become charged and stick to each other. Given that the density of this material is about \({\bf{35 kg/}}{{\bf{m}}^{\bf{3}}}\), estimate how much charge might be on a 2.0-cm-diameter foamed polystyrene sphere, assuming the electric force between two spheres stuck together is equal to the weight of one sphere.
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.
Given that the human body is mostly made of water, estimate the total amount of positive charge in a 75-kg person.
We are usually not aware of the electric force acting between two everyday objects because
(a) the electric force is one of the weakest forces in nature.
(b) the electric force is due to microscopic-sized particles such as electrons and protons.
(c) the electric force is invisible.
(d) most everyday objects have as many plus charges as minus charges.
\({Q_1} = - {\bf{0}}{\bf{.10}}\;{\bf{\mu C}}\)is located at the origin. \({Q_2} = {\bf{ + 0}}{\bf{.10}}\;{\bf{\mu C}}\) is located on the positive x-axis at \(x{\bf{ = 1}}{\bf{.0}}\;{\bf{m}}\). Which of the following is true of the force on \({Q_1}\) due to \({Q_2}\)?
(a) It is attractive and directed in the \( + x\) direction.
(b) It is attractive and directed in the \( - x\) direction.
(c) It is repulsive and directed in the \( + x\) direction.
(d) It is repulsive and directed in the \( - x\) direction.
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