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Chapter 25: Q. 39 (page 711)
A +3.0 nC charge is at x = 0 cm and a -1.0 nC charge is at x = 4 cm. At what point or points on the x-axis is the electric potential zero?
The points are 3 cm and 6 cm
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FIGURE P25.71 shows a thin rod with charge Q that has been bent into a semicircle of radius R. Find an expression for the electric potential at the center.
Physicists often use a different unit of energy, the electron volt, when dealing with energies at the atomic level. One electron volt, abbreviated eV, is defined as the amount of kinetic energy gained by an electron upon accelerating through a 1.0 V potential difference. a. What is 1 electron volt in joules? b. What is the speed of a proton with 5000 eV of kinetic energy?
A capacitor with plates separated by distance is charged to a potential difference . All wires and batteries are disconnected, then the two plates are pulled apart (with insulated handles) to a new separation of distance.
a. Does the capacitor charge change as the separation increases?
If so, by what factor? If not, why not?
b. Does the electric field strengthchange as the separation increases? If so, by what factor? If not, why not?
c. Does the potential difference change as the separation increases? If so, by what factor? If not, why not?
The wire in FIGURE P25.73 has linear charge density . What is the electric potential at the center of the semicircle?
A hollow cylindrical shell of length L and radius R has charge Q uniformly distributed along its length. What is the electric potential at the center of the cylinder ?
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