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Chapter 25: Q. 35 (page 710)
The two halves of the rod in FIGURE EX25.35 are uniformly charged to {Q. What is the electric potential at the point indicated by the dot?
The electric potential at the dot point is zero
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An electron with an initial speed of is brought to rest by an electric field.
a. Did the electron move into a region of higher potential or lower potential?
b. What was the potential difference that stopped the electron?
A proton is fired from far away toward the nucleus of an iron atom. Iron is element number , and the diameter of the nucleus is . What initial speed does the proton need to just reach the surface of the nucleus? Assume the nucleus remains at rest.
What is the electric potential energy of the group of charges in
FIGURE EX25.7?
In FIGURE EX25.26, a proton is fired with a speed of 200,000 m/s from the midpoint of the capacitor toward the positive plate.
a. Show that this is insufficient speed to reach the positive plate.
b. What is the proton鈥檚 speed as it collides with the negative plate?
Two small metal cubes with masses 2.0 g and 4.0 g are tied together by a 5.0-cm-long massless string and are at rest on a frictionless surface. Each is charged to +2.0 mC. a. What is the energy of this system? b. What is the tension in the string? c. The string is cut. What is the speed of each cube when they are far apart?
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