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Problem 1. Consider the insulating spherical shell, shown in cross section (and colored blue) in Figure 1 below. The shell has inner radius a and outer radius 30., and is centered at the coordinate origin. The shell has a uniform volume charge density +p. y Figure 1 For parts of all the problems on this homework labeled \"Numeric,\" use the values p = 4 x 10'5 Cfm3 and a = 0.5 m. For all other parts, do all calculations symbolically. (a) What is the total charge Q on the shell? Express your answer in terms of p and a and