Question

Hello please solve all of the problems on my worksheet. Thank you!

[67] A concentration, Q q/V, is changing in both time and space in the absence of external forces. All of the following deseribe the spontaneous change of this quantity EXCEPT (a) The current times the resistance equals the difference in the potential driving the flow (b) The relationship among rates of change is -Dv (c) q flows from a region of high concentration to an area of low concentration. (d) Entropy is increased by the flow. (e) Once the potential difference equals zero, there is no flow of q [68] As light travels in an absorbing medium, the rate of decrease in intensity is proportional to the intensity at that point. The intensity traveled in the medium is then a) linear and decreasing. b) quadratic and decreasing. c) an exponential decay. d) cannot be determined from the information given. as a function of distance [69] Phasors are used to represent quantities which a) have components which are 90° out of phase and vary with time. b) have components which differ in phase and change in time at different rates. c) change back and forth from real to virtual as time evolves. d) only relate to AC circuits 701 A ring of charge of radius R and charge Q is centered on the origin. To calculate the electric field at a point on the axial line through the center and distance d from the ring (z d), the correct integral expression is 1 Qde 4c, 2 R 2r 1 QRde 4x6, 2R [d + R ] d d b) +R I Q dix[Rcos,Rsin 0.d c) d 2rR 4 1 P OPO d) 4me

Answer 1

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