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Problem 4 [25 pts] Grader & Score Consider two circular disks centered on the origin so that when viewed from the side (i.e. the negative y-axis) they appear as bars in the diagram. Each disk has an area R2 and a positive charge Q. The disks are separated by a small distance s R so that the center of the top disk is located at<0,Q,s/2 > and the center of the bottom disk is at < 0,0, -s/2 >. Point B is far from the disks, ro » R, while Point A is close to the upper disk, zo «H A =< 0,0,20 > 2R A. [5 pts] By drawing arrows on the figure, indicate the directiou of the total electric field at locations A and B. B. [5 pts] Calculate the net electric field at the origin, (0,0,0).

C. [10 pts Using an appropriate approximation, calculate the net electric field at point A, 〈0,0, 20). D. [5 pts] Using the appropriate approximation, calculate the net electric field at point B, (ro,0,0). (Hint: what simple distribution of charge do the two disks resemble at large distances?)

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Answer #1

A. Electric field at point A is along z-axis. Electric field at point B is along x-axis.

B.its 0. By symmetry we can say that Electric field at centre is zero. Plates cancel out each others electric field.

C. 4kQ/R2

D. 2kQ/x02

k=9*10^9

mo> )んォて

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