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1 Assignment Previewer 1 of 5 9/4/2012 4:02 PM HW05Electric Potential ( ) Due: Fri Oct :00 PM EDT Question Question Details SerPSE8 25.P.001.MI. [ ] (a) Calculate the speed of a proton that is accelerated from rest through an electric potential difference of 142 V. 1.65e+05 m/s (b) Calculate the speed of an electron that is accelerated through the same potential difference. 7.06e+06 m/s 2. Question Details SerPSE8 25.P.003.WI. [ ] A uniform electric field of magnitude 260 V/m is directed in the negative y direction as shown in the figure below. The coordinates of point are (0.400, 0.850) m, and those of point are (0.800, 0.800) m. Calculate the electric potential difference V B V A using the dashedline path. 429 V 3. Question Details SerPSE8 25.P.005.MI. [ ] An electron moving parallel to the x axis has an initial speed of m/s at the origin. Its speed is reduced to m/s at the point x = 2.00 cm. (a) Calculate the electric potential difference between the origin and that point.

2 Assignment Previewer 2 of 5 9/4/2012 4:02 PM 28.7 Volts (b) Which point is at the higher potential? the origin the point x = 2.00 cm both have the same potential 4. Question Details SerPSE8 25.P.015.WI. [ ] Given two particles with Q = 4.40µC charges as shown in the figure below and a particle with charge q = C at the origin. (Note: Assume a reference level of potential V = 0 at r =.) (a) What is the net force exerted by the two 4.40µC charges on the test charge q? 0 N (b) What is the electric field at the origin due to the two 4.40µC particles? 0 N/C (c) What is the electrical potential at the origin due to the two 4.40µC particles? 98.9 kv 5. Question Details SerPSE8 25.P.016. [ ] The two charges in the figure below are separated by a distance d = 4.50 cm, and Q = nc.

3 Assignment Previewer 3 of 5 9/4/2012 4:02 PM (a) Find the electric potential at A kv (b) Find the electric potential at B kv (c) Find the electric potential difference between B and A. 152 V 6. Question Details SerPSE8 25.P.019. [ ] A charge +q is at the origin. A charge 2q is at x = 5.00 m on the +x axis. (a) For what finite value of x is the electric field zero? 12.1 m (b) For what finite values of x is the electric potential zero? (Note: Assume a reference level of potential V = 0 at r =.) Smallest value of x: 5 m Largest value of x: 1.67 m 7. Question Details SerPSE8 25.P.033.WI. [ ] The potential in a region between x = 0 and x = 6.00 m is V = a + bx, where a = 16.4 V and b = 7.90 V/m.

4 Assignment Previewer 4 of 5 9/4/2012 4:02 PM (a) Determine the potential at x = V Determine the potential at x = 3.00 m. 7.3 V Determine the potential at x = 6.00 m. 31 V (b) Determine the magnitude and direction of the electric field at x = 0. magnitude 7.9 V/m direction +x Determine the magnitude and direction of the electric field at x = 3.00 m. magnitude 7.9 V/m direction +x Determine the magnitude and direction of the electric field at x = 6.00 m. magnitude 7.9 V/m direction +x 8. Question Details SerPSE8 25.P.040.WI. [ ] A uniformly charged insulating rod of length 12.0 cm is bent into the shape of a semicircle as shown in the figure below. The rod has a total charge of 7.00 µc. Find the electric potential at O, the center of the semicircle MV

5 Assignment Previewer 5 of 5 9/4/2012 4:02 PM 9. Question Details SerPSE8 25.P.045. [ ] How many electrons should be removed from an initially uncharged spherical conductor of radius m to produce a potential of 6.00 kv at the surface? 4.17e+11 electrons 10. Question Details SerPSE8 25.P.055. [ ] The electric potential immediately outside a charged conducting sphere is 190 V, and 10.0 cm farther from the center of the sphere the potential is 140 V. (a) Determine the radius of the sphere. 28 cm (b) Determine the charge on the sphere nc The electric potential immediately outside another charged conducting sphere is 210 V, and 10.0 cm farther from the center the magnitude of the electric field is 360 V/m. (c) Determine all possible values for the radius of the sphere. (Enter your answers from smallest to largest. If only one value exists, enter "NONE" in the second answer blank.) r 1 = 2.82 cm r 2 = 35.5 cm (d) Determine the charge on the sphere for each value of r. (If only one value exists, enter "NONE" in the second answer blank.) q 1 = nc q 2 = 8.3 nc Assignment Details

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