a volumetric charge density is defined, in cylindrical
coordinates for the region 0,005=<p<=0,02 , 0=<phi<=π/2
, 0=<Z<=0,04
Pv = (p^2 -10^(-4))xZxsin(2phi) C/m^3 and Pv=0 for all remaning
space
find the maximum Pv and the total charge in space
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