The region between two concentric metal spherical shells (radius a and b, respectively) is filled with a weakly conducting material of conductivity o. assume the outer shell is electrically grounded, and a battery maintains a potential difference of v = v between the two shells. (in this problem, don't confuse conductivity, o, with surface charge density. also, ignore any dielectric properties of the weakly conducting material). (a) what total current, i, flows between the shells? also, what is the total resistance, r, of the weakly conducting material between the shells? (b) revisit griffiths section 2.5.4, and re-express your final answers (for i and r) in part a, in terms of the total capacitance, c, for this same arrangement of two concentric shells. c) now, suppose the battery maintaining (vi=v, between the concentric spheres is suddenly disconnected at t = 0. (at t=0, av between inner and outer spheres is thus vo, but there is no battery to maintain this) describe qualitatively what you expect happens over time. then, calculate the voltage, and the current that flows, between the two shells as a function of time, i. e., find v(t) and it). does your calculation agree with your qualitative prediction? (d) for the situation of part c, calculate the original total energy stored in the spherical capacitor (use griffiths eq. 2.55). by integrating power (= v*i), explicitly confirm that the heat delivered to the resistance is equal to the energy lost!
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Physics, 21.06.2019 23:30, jetblackcap
Which of the following statements is true about women and minorities in early psychology? a. in the early 20th century, numerous graduate schools recruited women and minorities to study psychology. b. opportunities in higher education were limited for women and minorities in the early 20th century due to discrimination. c. despite some obstacles, there were numerous employment opportunities for women and minorities. d. women and minorities were often selected to do academic research in an effort to make the field more diverse.
Answers: 3
Physics, 22.06.2019 06:30, jordanbyrd33
Air initially at 0.75 bar, 1000 k, and occupying a volume of 0.12 m^3 undergoes two processes. process 1-2: the air is compressed isothermally until the volume is halved. process 2-3: the air undergoes a constant pressure process until the volume is halved again. assume ideal gas behavior. a) determine the mass of the air, in kg. b) the work and the heat transfer for each of the two processes, in kj. (100 kj = 1 bar . m^3)
Answers: 1
Physics, 22.06.2019 13:50, Geo777
Two students, each riding bicycles, start from the same apartment building and ride to the same building on campus, but each takes a different route. the first student rides 1100 m due east and then turns due north and travels another 1430 m before arriving at the destination. the second student heads due north for 1930 m and then turns and heads directly toward the destination. at the turning point, how far is the second student from the destination?
Answers: 3
Physics, 22.06.2019 18:00, championroof
Acid precipitation chemically weathering a 5.0-kg limestone rock . which coukd be the result ?
Answers: 1
The region between two concentric metal spherical shells (radius a and b, respectively) is filled wi...
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