CALC A nonuniform, but spherically symmetric, distribution of charge has a charge density ?(r) given as follows: where ?0 = 3Q/?R3 is a positive constant. (a) Show that the total charge contained in the charge distribution is Q. (b) Show that the electric field in the region r ? R is identical to that produced by a point charge Q at r = 0. (c) Obtain an expression for the electric field in the region r ? R. (d) Graph the electric-field magnitude E as a function of r. (e) Find the value of r at which the electric field is maximum, and find the value of that maximum field.

Population Distribution Lecture Notes Chapter 11 2/16/17 Population distribution -Geographic range: total area -Species Niche: range of conditions -Fundamental Niche: whole range a species COULD occupy -Realized Niche: Range a species ACTUALLY occupies Patterns of distribution suggest species niches. So how do we test whether species are really limited to particular...