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Chapter 25: Q. 40 (page 711)
A -3.0 nC charge is on the x-axis at x = -9 cm and a +4.0 nC
charge is on the x-axis at x = 16 cm. At what point or points on
the y-axis is the electric potential zero?
The points on y-axis where the potential of electric is zero are
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Two-diameter electrodes apart form a parallel plate capacitor. The electrodes are attached by metal wires to
the terminals of a battery. After a long time, the capacitor is disconnected from the battery but is not discharged. What are the charge on each electrode, the electric field strength inside the capacitor, and the potential difference between the electrodes
a. Right after the battery is disconnected?
b. After insulating handles are used to pull the electrodes away from each other until they are apart?
c. After the original electrodes (not the modified electrodes of part b) are expanded until they are in diameter?
In Problems 74 through 76 you are given the equation(s) used to solve a problem. For each of these,
a. Write a realistic problem for which this is the correct equation(s).
b. Finish the solution of the problem.
75.
The electric field strength is inside a parallel-plate capacitor with a spacing. A proton is released from rest at the positive plate. What is the proton鈥檚 speed when it reaches the negative plate?
Two spherical drops of mercury each have a charge of and a potential of at the surface. The two drops merge to form a single drop. What is the potential at the surface of the new drop?
The wire in FIGURE P25.73 has linear charge density . What is the electric potential at the center of the semicircle?
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