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Chapter 25: Q. 21 (page 710)
Show that 1 V/m = 1 N/C.
Proved that 1V/m=1N/C
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In proton-beam therapy, a high-energy beam of protons is fired at a tumor. As the protons stop in the tumor, their kinetic energy breaks apart the tumor’s DNA, thus killing the tumor cells. For one patient, it is desired to deposit of proton energy in the tumor. To create the proton beam, protons are accelerated from rest through a potential difference. What is the total charge of the protons that must be fired at the tumor?
Three electrons form an equilateral triangle with 1.0 nm on each side. A proton is at the center of the triangle. What is the potential energy of this group of charges?
Two 2.0-cm-diameter disks spaced 2.0 mm apart form a
parallel-plate capacitor. The electric field between the disks is
.
a. What is the voltage across the capacitor?
b. An electron is launched from the negative plate. It strikes the
positive plate at a speed of .
What was the electron’s speed as it left the negative plate?
FIGURE P25.66 shows two uniformly charged spheres.
What is the potential difference between points?
Which point is at the higher potential?
Two positive point charges q are located on the y-axis at.
a.Find an expression for the potential along the x-axis.
b.Draw a graph of V versus x for . For comparison, use a dotted line to show the potential of a point charge 2qlocated at the origin.
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