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Chapter 18: Q2PE (page 664)
If 1.80脳1020 electrons move through a pocket calculator during a full day鈥檚 operation, how many coulombs of charge moved through it?
The charge moved during a full day鈥檚 operation of pocket calculator is-28.8 C.
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An electron has an initial velocity of\(5.00 \times {10^6}{\rm{ m}}/{\rm{s}}\)in a uniform\(2.00 \times {10^5}{\rm{ N}}/{\rm{C}}\)strength electric field. The field accelerates the electron in the direction opposite to its initial velocity. (a) What is the direction of the electric field? (b) How far does the electron travel before coming to rest? (c) How long does it take the electron to come to rest? (d) What is the electron鈥檚 velocity when it returns to its starting point?
Calculate the magnitude of the electric field 2.00 m from a point charge of 5.00 mC (such as found on the terminal of a Van de Graaff).
An eccentric inventor attempts to levitate by first placing a large negative charge on himself and then putting a large positive charge on the ceiling of his workshop. Instead, while attempting to place a large negative charge on himself, his clothes fly off. Explain.
Figure 18.43 shows the charge distribution in a water molecule, which is called a polar molecule because it has an inherent separation of charge. Given water鈥檚 polar character, explain what effect humidity has on removing excess charge from objects.
Figure 18.43 Schematic representation of the outer electron cloud of a neutral water molecule. The electrons spend more time near the oxygen than the hydrogens, giving a permanent charge separation as shown. Water is thus a polar molecule. It is more easily affected by electrostatic forces than molecules with uniform charge distributions.
What can you say about two charges \({q_1}\) and \({q_2}\), if the electric field one-fourth of the way from \({q_1}\) to \({q_2}\) is zero?
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