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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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Using the symmetry of the arrangement, determine the direction of the force on\(q\)in the figure below, given that\({q_a} = {q_b} = + 7.50{\rm{ }}\mu {\rm{C}}\)and\({q_c} = {q_d} = - 7.50{\rm{ }}\mu {\rm{C}}\). (b) Calculate the magnitude of the force on the charge\(q\), given that the square is\(10.0{\rm{ cm}}\)on a side and\(q = {\rm{2}}{\rm{.00 }}\mu {\rm{C}}\).
Describe how a positively charged object can be used to give another object a negative charge. What is the name of this process?
Point charges of\(25.0{\rm{ }}\mu {\rm{C}}\)and\(45.0{\rm{ }}\mu {\rm{C}}\)are placed\(0.500{\rm{ m}}\)apart. (a) At what point along the line between them is the electric field zero? (b) What is the electric field halfway between them?
A simple and common technique for accelerating electrons is shown in Figure 18.55, where there is a uniform electric field between two plates. Electrons are released, usually from a hot filament, near the negative plate, and there is a small hole in the positive plate that allows the electrons to continue moving. (a) Calculate the acceleration of the electron if the field strength is\(2.50 \times {10^4}{\rm{ N/C}}\). (b) Explain why the electron will not be pulled back to the positive plate once it moves through the hole.
Figure 18.55 Parallel conducting plates with opposite charges on them create a relatively uniform electric field used to accelerate electrons to the right. Those that go through the hole can be used to make a TV or computer screen glow or to produce X-rays.
If two equal charges each of\({\rm{1 C}}\)each are separated in air by a distance of\({\rm{1 km}}\), what is the magnitude of the force acting between them? You will see that even at a distance as large as\({\rm{1 km}}\), the repulsive force is substantial because\({\rm{1 C}}\)is a very significant amount of charge.
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