Measurements of the potential at points on the axis of a charged disk are given in the

Chapter 22, Problem 73

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Measurements of the potential at points on the axis of a charged disk are given in the two tables below, one for measurements made close to the disk and the other for measurements made far away. In both tables x is the coordinate measured along the disk axis with the origin at the disk center, and the zero of potential is taken at infinity. (a) For each set of data, determine a quantity that, when you plot potential against it, should yield a straight line. Make your plots, establish a best-fit line, and determine its slope. Use your slopes to find (b) the total charge on the disk and (c) the disk radius. (Hint: Consult Example 22.7.) Table 1 x (mm) 2.0 4.0 6.0 8.0 10.0 V (V) 900 876 843 820 797 Table 2 x (cm) 20 30 40 60 100 V (V) 165 118 80 58 30